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Synonyms for un sure
adj doubtful, insecure

shaky
skeptical
unclear
uncertain
hesitant
indecisive
suspicious
mistrustful
dubious
undecided

distrustful
borderline
fly-by-night
iffy
indeterminate
irresolute
lacking
open
problematic
undependable

unreliable
unstable
untrustworthy
vacillating
wavering
weak
wobbly
unconvinced
betwixt and between
fluctuant

in a quandary
rootless
touch and go
unassured
unconfident
untrusty
up for grabs
wimpy

Antonyms for un sure

unwavering
believing
determined
trustworthy

trusty
undoubted
certain
sure

clear
definite
secure
indubious

Synonyms
adj conflicting

uncertain
equivocal
hesitant
doubtful
contradictory

undecided
mixed
unsure
clashing
debatable

inconclusive
irresolute
opposed
unresolved
vacillating

warring
wavering
fluctuating

Antonyms

determined
unquestionable
settled
undoubted

unequivocal
certain
clear
definite

secure
sure
decided
resolved

Synonyms
adj debatable

contentious
dubious
controversial

disputable
doubtful
moot

questionable
uncertain
unsure

open to question
sub judice

Antonyms

untenable

certain

Synonyms
adj hesitant; unconfident

sheepish
demure
meek
self-effacing
bashful
unassuming
timid
self-conscious
shy

unsure
backward
chary
coy
distrustful
doubtful
dubious
humble
insecure

modest
mousy
reluctant
reserved
retiring
shrinking
suspicious
timorous
unobtrusive

withdrawn
constrained
blenching
flinching
rabbity
unassertive
unassured
unpoised

Antonyms

extroverted
brave

confident
aggressive

bold

Synonyms
adj questionable, unclear

indecisive
unsure
problematic
insecure
suspicious
precarious
dubious
uneasy
unstable
hazy
undecided
unsettled

uncertain
dicey
debatable
ambiguous
borderline
chancy
contingent
disreputable
equivocal
far-fetched
fat chance
fishy

hazardous
iffy
inconclusive
indefinite
indeterminate
indistinct
long shot
obscure
open
pending
shady
sneaky

speculative
suspect
touch-and-go
touchy
clouded
dubitable
doubtable
impugnable
on thin ice
unconfirmed
up for grabs

Antonyms

determined
undoubted
settled
trustworthy
trusty
stable
confirmed
unquestionable

believing
confident
convinced
trusting
certain
definite
sure
secure

safe
strong
clear
decided
exact
resolved
indubious

Synonyms
adj not believing

skeptical
uncertain
hesitant
tentative
unsettled
indecisive
suspicious
dubious
undecided
unsure
puzzled

agnostic
confused
disconcerted
distracted
distrustful
disturbed
doubting
equivocal
faithless
hesitating
irresolute

lost
perplexed
questioning
theoretical
troubled
unresolved
vacillating
wavering
unconvinced
baffled
discomposed

faltering
flustered
in a quandary
in clouds
in dilemma
like doubting Thomas
not following
of two minds
without belief

Antonyms

determined
decisive
settled
trustworthy
trusty
undoubted
confirmed

unquestionable
believing
confident
convinced
trusting
certain
clear

definite
secure
sure
decided
exact
resolved

Synonyms
adj doubtful

questionable
skeptical
unclear
uncertain
equivocal
hesitant
improbable
problematic
shady
suspicious

arguable
fishy
unreliable
unsure
reluctant
debatable
chancy
diffident
disputable
far-fetched

fly-by-night
iffy
indecisive
moot
open
perplexed
suspect
undecided
undependable
unlikely

untrustworthy
wavering
dubitable
mootable
unconvinced
touch and go
trustless
unassured
untrusty

Antonyms

undoubted
unquestionable
determined
believable
likely
probable
aboveboard
trustworthy

honest
reliable
trusty
unambiguous
certain
definite
sure
clear

secure
doubtless
positive
undoubtful
indubious
unobscure

Synonyms
adj unreliable and shady

ephemeral
passing
temporary
brief
cowboy
disreputable
dubious

evanescent
fleeting
impermanent
irresponsible
momentary
questionable
shady

shifty
short-lived
slimy
slippery
treacherous
undependable
unprofessional

unreliable
unsure
untrustworthy
here-today-gone-tomorrow
not to be relied upon
not to be trusted
trustless

Antonyms

enduring
lasting
permanent

dependable
reliable
reputable

trustworthy
long
responsible

Synonyms
adj uncertain, waiting

skeptical
slow
unsure
tentative
shy
indecisive
doubtful
halting

loath
afraid
averse
unwilling
timid
reluctant
backward
delaying

diffident
disinclined
doubting
half-hearted
hesitating
irresolute
lazy
unpredictable

vacillating
wavering
dawdling
faltering
hanging back
lacking confidence
uneager

Antonyms

believing
decisive
confident
extroverted
willing
brave

fearless
eager
resolute
unwavering
ready
certain

definite
sure
bold
unhesitant

Synonyms
adj not feeling at ease

anxious
apprehensive
awkward
disturbed
doubtful
edgy
fidgety

hesitant
insecure
nervous
on edge
restless
self-conscious
shy

suspicious
tense
uncomfortable
uneasy
unsettled
unsure
discomfited

disquieted
faltering
on pins and needles
on tenterhooks
out of place
unrelaxed

Antonyms

content

at ease

comfortable

Synonyms
adj ambiguous, vague

undetermined
infinite
unlimited
undefined
broad
confused
doubtful
dubious

equivocal
evasive
general
ill-defined
indeterminate
indistinct
inexact
inexhaustible

innumerable
intangible
loose
obscure
shadowy
uncertain
unclear
undependable

unknown
unsettled
unsure
wide
imprecise
indeterminable
unfixed
unspecific

Antonyms

bounded
finite
definite

limited
certain
distinct

sure

Synonyms
adj uncertain, worried

afraid
unsure
hesitant
touchy
shaky
apprehensive

anxious
uptight
troubled
diffident
jumpy
questioning

up in the air
vague
Delphic
choked
hanging by thread
on thin ice

touch and go
unassured
unconfident
unpoised

Antonyms

composed
unafraid
unwavering
peaceful
collected
confident
guarded

protected
cool
happy
certain
definite
sure
calm

at ease
quiet
unworried
secure
safe
sound

Synonyms
adj indefinite, obscured

unreal
ethereal
hypothetical
slight
abstract
impalpable
imponderable
abstruse

airy
dim
elusive
evanescent
evasive
imperceptible
incorporeal
indeterminate

insensible
invisible
rare
shadowy
slender
uncertain
unsubstantial
unsure

vague
inappreciable
unobservable
eluding
evading
unapparent

Antonyms

factual
real
obvious

perceptible
tangible
definite

palpable

Synonyms
adj suspicious

distrustful
skeptical
cautious

uncertain
wary
dubious

unsure
careful
chary

doubting
shy
on one’s guard

Antonyms

believing
heedless
incautious
rash
unwary

certain
careless
thoughtless
uncareful
clear

definite
secure
sure

Synonyms
adj undecided

ambivalent
borderline
debatable
divided
hesitant
iffy
impartial
indecisive

irresolute
neutral
open
tentative
torn
uncertain
unclear
uncommitted

undetermined
unsure
up in the air
wavering
wishy-washy
betwixt and between
blowing hot and cold
hemming and hawing

in the middle
not definite
not sure
of two minds
running hot and cold
waffling

Synonyms
adj dangerous

uncertain
touchy
threatening
hazardous
shaky
treacherous
precarious
unstable

delicate
ticklish
rugged
dicey
risky
chancy
exposed
hairy

insecure
loaded
unhealthy
unsafe
unsound
unsteady
unsure
vulnerable

wicked
dynamite
Russian roulette
on thin ice
playing with fire
touch and go

Antonyms

stable
OK
certain
definite
secure

sure
calm
nice
safe
firm

steady
strong
easy

Synonyms
adj tricky, doubtful

hazardous
dangerous
uncertain
unhealthy
touchy
unsettled
insecure
shaky
risky
unreliable

rocky
unstable
delicate
ticklish
slippery
unsteady
problematic
perilous
dicey
ambiguous

borderline
chancy
contingent
dubious
equivocal
hairy
iffy
indecisive
loaded
open

out on a limb
rugged
sensitive
unsafe
unsure
dynamite
hanging by a thread
impugnable
on thin ice
touch and go

Antonyms

guarded
protected
healthy
settled
reliable
stable

undoubted
certain
safe
secure
definite
sure

strong
happy
steady
firm

Synonyms
adj insecure with oneself

anxious
sheepish
unsure
stilted
awkward
stiff

shy
bashful
embarrassed
uneasy
uncomfortable
nervous

mannered
affected
artificial
diffident
shamefaced
uncertain

discomfited
ill-at-ease
out of countenance

Antonyms

content
graceful
confident
calm
happy

unworried
unashamed
easy
comfortable
assured

secure
sure
unself-conscious
unshy

Synonyms
adj trembling

rocky
nervous
insecure
weak
precarious
unstable
wobbly
unsettled
jittery
rickety

unsteady
infirm
jerry-built
rattletrap
shaking
tremulous
unsound
unsure
vacillating
wavering

yielding
aquiver
quivery
tottering
tottery
tumbledown
all aquiver
aquake
ashake
faltering

fluctuant
jellylike
not set
quaking
rootless
tremorous
unfirm

Antonyms

brave
confident
guarded
protected
stable
unwavering

steady
happy
certain
secure
sure
safe

sound
firm
strong
definite
unshaky
indubious

Synonyms
adj doubtful

questionable
unclear
uncertain
unsettled
precarious

dubious
unsteady
indecisive
problematic
suspect

undependable
unreliable
unsound
unsure
not dependable

not reliable
unsupported

Antonyms

undoubted
stable
unwavering
certain

definite
sure
clear
firm

steady
unshaky
indubious

Synonyms
adj doubtful

suspected
thick
pseudo
thin
open

dubious
fishy
incredible
problematic
questionable

ridiculous
shaky
suspicious
unbelievable
uncertain

unclear
unlikely
unsure
doubtable

Antonyms

known
trusted

trustworthy
innocent

Synonyms
adj doubtful, fishy

questionable
uncertain
unusual
unsure
dubious
borderline
debatable
different

disputable
equivocal
farfetched
funny
irregular
open
overt
peculiar

phony
problematic
queer
reaching
shady
shaky
suspect
too much

uncommon
doubtable
not kosher
open to doubt
open to question
out of line
rings untrue
won’t wash

Antonyms

undoubted
trustworthy
trusty
believable
unquestionable

certain
definite
sure
clear
secure

innocent
palpable
indubious

Synonyms
adj indefinite, uncertain

cautious
unsure
hesitant
wobbly

timid
reluctant
backward
diffident

disinclined
doubtful
halting
irresolute

undecided
vacillating
vacillatory
faltering

Antonyms

decisive
conclusive

certain
definite

sure
final

Synonyms
adj undecided

divided
vacillating

split
wavering

irresolute
uncertain

unsure
of two minds

Antonyms

mended
resolute
fixed

healed
perfect
certain

decided
sure

Synonyms
adj doubtful, changeable

questionable
ambiguous
unclear
unsure
hesitant
undetermined
unsettled
insecure
precarious
dubious
erratic

unpredictable
unresolved
hazy
undecided
unreliable
risky
vague
ambivalent
chancy
conjectural
fitful

iffy
incalculable
inconstant
indefinite
indeterminate
indistinct
irregular
irresolute
speculative
unforeseeable
up in the air

vacillating
variable
wavering
hanging by a thread
on thin ice
touch and go
unconfirmed
unfixed
up for grabs

Antonyms

undoubted
determined
settled
reliable
trustworthy
predictable

unchanging
certain
definite
sure
clear
secure

decided
safe
resolved
foreseeable

Synonyms
adj not sure, not definite

undetermined
unclear
uncertain
hesitant
doubtful
uncommitted
wavering
unsure
vague
ambivalent

borderline
debatable
dubious
equivocal
iffy
indecisive
indefinite
irresolute
moot
on the fence

open
pending
tentative
torn
unfinished
unsettled
up in the air
wishy-washy
betwixt and between
blowing hot and cold

dithering
hemming and hawing
in the middle
of two minds
pendent
running hot and cold
waffling

Antonyms

determined
settled
undoubted
clear

certain
definite
secure
sure

resolved
decided

Synonyms
adj irresponsible

unreliable
bum
capricious
careless
changeable
dubious
erratic
fickle

fly-by-night
inconsistent
inconstant
indefinite
indeterminate
loose
treacherous
trick

tricky
uncertain
unpredictable
unsafe
unsound
unstable
unsure
untrustworthy

variable
no-good
no bargain
trustless
unassured

Antonyms

dependable
reliable

trustworthy
responsible

Synonyms
adj not trustworthy, not true

tricky
uncertain
inaccurate
irresponsible
treacherous
dubious
unsound
fickle
unstable
deceptive
untrustworthy

capricious
undependable
deceitful
delusive
disreputable
erroneous
fake
fallible
fly-by-night
furtive
hollow

implausible
inconstant
makeshift
meretricious
mistaken
pretended
pseudo
questionable
sham
shifty
specious

unconvincing
underhand
underhanded
unfaithful
unsure
untrue
vacillating
wavering
weak
hallucinatory
false

Antonyms

frank
honest
reliable
trustworthy
forthright
stable
truthful

dependable
certain
clear
definite
sure
accurate
correct

right
true
strong
constant
faithful
steady
responsible

Synonyms
adj not dependable, unfaithful

treacherous
deceitful
dishonest
irresponsible
disloyal
unsafe
unreliable
capricious
crooked

devious
dubious
faithless
fickle
fink
fly-by-night
questionable
shady
sharp

shifty
slippery
sneaky
tricky
two-faced
two-timing
undependable
unsure
untrue

guileful
false
untrusty
conniving
fair-weather
trustless
unassured

Antonyms

honest
loyal
harmless
reliable

truthful
frank
trustworthy
dependable

true
faithful
open
responsible

Synonyms
adj not definite or clear

ambiguous
unclear
uncertain
equivocal
faint
dubious
nebulous
lax
hazy
fuzzy
obscure
unsure

amorphous
bleary
cloudy
dark
dim
doubtful
enigmatic
ill-defined
impalpable
indefinite
indeterminate
indistinct

inexplicable
loose
misunderstood
muddy
perplexing
problematic
puzzling
questionable
shadowy
superficial
tenebrous
undetermined

unintelligible
unknown
unsettled
unspecified
imprecise
dreamlike
amphibological
bewildering
blurred
generalized
unexplicit

Antonyms

explicit
determined
obvious
clear

definite
certain
secure
sure

plain
distinct
apparent

Synonyms
adj cowardly

indecisive
uncertain
hesitant
nervous
insecure
shaky
ineffectual
unstable

wobbly
soft
powerless
frightened
impotent
infirm
irresolute
laid-back

nerveless
palsied
spineless
tender
timorous
undependable
unreliable
unsure

vacillating
wavering
wishy-washy
zero
faint-hearted
fluctuant
weak-kneed
wimpy

Antonyms

determined
unwavering
stable
potent
brave
confident
noisy
capable
sufficient

guarded
protected
certain
definite
sure
secure
firm
steady
strong

bold
loud
able
fit
safe
concentrated
thick
unshaky

Synonyms
adj deficient, feeble

poor
limited
inept
lacking
inadequate
shaky
ineffective
ineffectual
thin
small
immature
slim

incomplete
faulty
flabby
flimsy
green
handicapped
hollow
implausible
impotent
improbable
incompetent
inconceivable

inconclusive
incredible
invalid
lame
pathetic
raw
shallow
slight
spineless
substandard
thick
unbelievable

unconvincing
unprepared
unqualified
unsatisfactory
unsubstantial
unsure
untrained
wanting
forceless

Antonyms

adequate
sufficient
competent
enough
potent
brave
confident

noisy
capable
guarded
protected
strong
able
effective

firm
bold
loud
fit
safe
secure
concentrated

Synonyms
adj shaky

uneven
insecure
weak
precarious
unstable

unsteady
rickety
unbalanced
wavering
rattletrap

rocky
unsafe
unsure
vacillating
wavy

tottering
fluctuant
teetering
wiggling

Antonyms

confident
guarded
protected
stable
balanced

even
certain
secure
sure
safe

sound
firm
strong
steady
unshaky

Synonyms
adj doubtful

irresolute

skeptical

uncertain

unsure

Synonyms
adj uncomfortable

anxious
awkward
disturbed
doubtful
edgy
fidgety

hesitant
nervous
on edge
restless
self-conscious
suspicious

tense
uneasy
unsettled
unsure
discomfited
disquieted

faltering
on tenterhooks
unrelaxed

Antonyms

at ease

comfortable

Synonyms
adj uncertain

undecided
variable
vacillating

hesitating
fickle
unstable

unsteady
unsure
waffling

fluctuating
irresoluteoscillating

Antonyms

unchanging

Synonyms
adj changing

hesitating
wavering
changeable
hesitant

inconstant
irresolute
tentative
uncertain

undecided
unsure
volatile
fluctuating

swaying
oscillating
vibrating
shifting

Antonyms

resolute
unchanging

constant
steady

Synonyms
adj not resolute

unsettled
wavering

hesitating
indecisive

irresolute
uncertain

unsure
vacillant

Antonyms

resolute
unchanging

constant
steady

Synonyms
adj not clear

ambiguous
uncertain
unsettled
confused
hazy

fuzzy
obscure
vague
unsure
cloudy

dim
elusive
intangible
nebulous
shadowy

blurry
imprecise

Antonyms

explicit
clear

definite
certain

secure
sure

Synonyms
adj ambiguous

concerned
troubled
borderline
chancy
dubious

dubitable
equivocal
inconclusive
indecisive
indeterminate

questionable
uncertain
unclear
unknown
unsure

vague
in doubt
in question

Antonyms

untroubled

Synonyms
adj doubtful

borderline
chancy
clouded
dubious
equivocal

iffy
inconclusive
indecisive
indeterminate
questionable

shady
suspicious
uncertain
unclear
unsure

doubtable
in doubt
in question

Synonyms
adj ambiguous

borderline
chancy
clouded
cryptic
doubtful
dubious
dubitable
enigmatic

equivocal
inconclusive
indecisive
indefinite
indeterminate
inexplicit
muddy
obscure

opaque
problematic
puzzling
questionable
tenebrous
uncertain
unclear
unintelligible

unsure
vague
at issue
clear as dishwater
enigmatical
in doubt
in question

Synonyms
adj insecure

loose
vacillating
wavering
exposed
defenseless
frail
hazardous
immature

infirm
insubstantial
perilous
precarious
rickety
rocky
shaky
tottery

unguarded
unprotected
unreliable
unsafe
unsound
unstable
unsteady
unsure

vulnerable
weak
wobbly
rootless
fluctuant
open to attack
unshielded

Synonyms
adj insecure

defenseless
exposed
frail
hazardous
immature
infirm
insubstantial
loose

perilous
precarious
rickety
rocky
shaky
tottering
unguarded
unprotected

unreliable
unsafe
unsound
unstable
unsteady
unsure
vacillating
vulnerable

wavering
weak
wobbly
fluctuant
open to attack
rootless
unshielded

Synonyms
adj doubtful

ambiguous
borderline
chancy
clouded
contingent
debatable
dicey
disreputable
dubious
dubitable
equivocal
far-fetched
fat chance

fishy
hazardous
hazy
iffy
improbable
inconclusive
indecisive
indefinite
indeterminate
indistinct
insecure
long shot
obscure

open
pending
precarious
problematic
questionable
shady
sneaky
speculative
suspect
suspicious
touch-and-go
touchy
uncertain

undecided
uneasy
unlikely
unsettled
unstable
unsure
doubtable
impugnable
on thin ice
unconfirmed
up for grabs

Synonyms
adj hesitant

afraid
averse
backward
delaying
diffident
disinclined
doubtful
doubting
half-hearted

halting
hesitating
indecisive
irresolute
lazy
loath
pendulous
reluctant
shilly-shally

shy
skeptical
slow
tentative
timid
unpredictable
unsure
unwilling
vacillating

vacillatory
wavering
dawdling
faltering
hanging back
lacking confidence
uneager

Synonyms
adj hesitant

afraid
averse
backward
delaying
diffident
disinclined
doubtful
doubting
half-hearted

halting
hesitating
indecisive
irresolute
lazy
loath
pendulous
reluctant
shilly-shally

shy
skeptical
slow
tentative
timid
unpredictable
unsure
unwilling
vacillant

vacillating
wavering
dawdling
faltering
hanging back
lacking confidence
uneager

Usage Notes

Both sure and surely are used as intensifying adverbs with the sense “undoubtedly, certainly.” In this use, sure is generally informal and occurs mainly in speech and written representations of speech: She sure dazzled the audience with her acceptance speech. It was sure hot enough in the auditorium. Surely is used in this sense in all varieties of speech and writing, even the most formal: The court ruled that the law was surely meant to apply to both profit-making and nonprofit organizations. See also quick, slow.