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Synonyms for un failing
adj certain, unchanging

steadfast
unflagging
eternal
inexhaustible
boundless
bottomless
absolute
assiduous
ceaseless
consistent
constant

continual
continuing
continuous
dependable
diligent
dyed-in-the-wool
endless
faithful
infallible
invariable
loyal

persistent
reliable
same
solid
staunch
straight
sure
tried-and-true
trustworthy
unlimited
unrelenting

true
come-through
counted on
delivering
never-failing
rock solid
surefire
there

Antonyms for un failing

changing
failing

impermanent
uncertain

unsure
limited

Synonyms
adj constant, regular

steady
persistent
logical
dependable
rational

even
expected
homogeneous
invariable
same

unchanging
unfailing
uniform
unvarying
true

of a piece
true to type
undeviating

Antonyms

unsteady
untrustworthy
irrational
dishonest
disagreeing

erratic
incongruous
inconsistent
inconstant
varying

incompatible
unsuitable
unreasonable
irregular
unfitting

Synonyms
adj loyal, determined

faithful
fast
trusty
dependable
devoted

dogged
persevering
resolute
staunch
tried-and-true

trustworthy
unfailing
unflagging
unshaken
unwavering

allegiant
true
attached

Antonyms

dishonest
disloyal
untrustworthy
changeable
fickle
inconstant
unstable
unsteady

varying
concluding
interrupted
flagging
undecided
undetermined
untrue
false

fluctuating
irregular
wavering
ending
stopping
terminable
terminating

Synonyms
adj constant, incessant

ceaseless
unceasing
around-the-clock
continuous
steady
persistent
perpetual
unending
repeated
unbroken

enduring
unremitting
uninterrupted
interminable
recurrent
relentless
frequent
endless
connected
consecutive

eternal
everlasting
permanent
regular
repetitive
running
timeless
unchanging
unfailing
unflagging

unvarying
dateless
aeonian
oft-repeated
persisting
staying
unwaning

Antonyms

completed
infrequent
occasional
discontinuous
intermittent
interrupted
sporadic

transient
bounded
halting
inconstant
temporary
ceasing
ending

finished
irregular
stopping
broken
terminable
checked

Synonyms
adj reliable, responsible

sturdy
steady
trustworthy
loyal
staunch
certain

constant
faithful
secure
stable
steadfast
sure

tried
tried-and-true
trusty
unfailing
true
always there

carrying the load
rocklike
to be counted on
good as one’s word

Antonyms

unstable
wobbly
unfaithful
untrustworthy
undependable

unreliable
disloyal
dishonest
irresponsible
uncertain

unsteady
unsure
weak

Synonyms
adj infallible

flawless
reliable
sure-fire
unassailable
perfect

tested
tried
guaranteed
certain
dependable

fail-safe
faultless
safe
sure
unerring

unfailing
goofproof
idiot-proof
never-failing

Synonyms
adj unerring, dependable

authoritative
flawless
unbeatable
foolproof
acceptable
accurate
agreeable
certain
correct
effective

effectual
efficacious
efficient
exact
faultless
handy
helpful
impeccable
incontrovertible
omniscient

perfect
positive
reliable
satisfactory
satisfying
sure
trustworthy
unfailing
unimpeachable
unquestionable

useful
true
apodictic
inerrable
inerrant
surefire
undeceivable

Antonyms

erring
fallible

faulty
imperfect

Synonyms
adj not changing

set
constant
same
uniform
immovable
regular
static

changeless
consistent
fixed
immutable
inflexible
monotonous
perpetual

rigid
unalterable
unchangeable
unchanging
unfailing
unvarying
unwavering

inalterable
unrelieved
undiversified
unmodifiable

Antonyms

undecided
movable
changeable
unsteady
inconsistent

unlike
changing
variable
mobile
varying

unfixed
irregular
wavering
different
moving

Synonyms
adj faithful, dependable

devoted
steadfast
trustworthy
patriotic
ardent
staunch
dutiful

allegiant
believing
constant
dyed-in-the-wool
firm
resolute
steady

tried-and-true
true-blue
trusty
unfailing
unswerving
unwavering
true

attached
behind one
coming through
on one’s side

Antonyms

disloyal
unfaithful

untrustworthy
unreliable

undependable
faithless

Synonyms
adj enduring, perpetual

eternal
recurrent
continuing
persistent
never-ending
chronic
continual
yearly
old

annual
immortal
permanent
constant
everlasting
abiding
ceaseless
deathless
durable

imperishable
incessant
inveterate
lasting
lifelong
long-lasting
sustained
unceasing
unchanging

undying
unfailing
uninterrupted
long-lived
perdurable
seasonal
longstanding
yearlong

Antonyms

temporary
infrequent
halting
intermittent

interrupted
occasional
ephemeral
concluding

changing
ending
ceasing
terminating

Synonyms
adj continual, lasting

ceaseless
constant
perennial
unceasing
continuous
eternal
persistent
never-ending
incessant
unending

permanent
enduring
infinite
interminable
endless
abiding
everlasting
immortal
imperishable
intermittent

recurrent
repeated
repeating
repetitious
returning
unchanging
undying
unfailing
uninterrupted
perdurable

sempiternal
unremitting
recurring
continued
going on
never-ceasing
reoccurring
without end

Antonyms

completed
changeable
interrupted
changing
intermittent
discontinuous
halting
ephemeral

temporary
transient
bounded
finite
fleeting
momentary
ceasing
ending

finished
irregular
stopping
terminable
limited
brief

Synonyms
adj trustworthy

good
solid
positive
sincere
safe
steady
honest
respectable
predictable
stable
dependable
decisive
strong

decent
candid
careful
certain
conscientious
constant
definite
determined
devoted
faithful
firm
honorable
impeccable

loyal
okay
proved
reputable
responsible
righteous
sound
staunch
steadfast
sterling
sure
tried
tried-and-true

true-blue
trusty
unequivocal
unfailing
unimpeachable
upright
veracious
true
high-principled
incorrupt
there
true-hearted

Antonyms

evil
unsuitable
inadequate
unreliable
unreal
intermittent
undependable
untrustworthy
vulnerable

indefinite
uncertain
unsure
dishonest
unstable
unsteady
wobbly
fraudulent
deceptive

irresponsible
bad
soft
broken
unfixed
weak
false
corrupt
unrespectable

Synonyms
adj unchanging

invariable
constant
uniform

changeless
consistent
perpetual

unchanged
unfailing
unvarying

unaltered

Antonyms

changeable
changing
varying

inconsistent
unlike
variable

different
polar
wavering

Synonyms
adj certain, definite

confident
clear
convinced
assured
positive
abiding
changeless
constant
convincing
decided
doubtless

enduring
firm
fixed
genuine
incontrovertible
indisputable
indubitable
persuaded
real
satisfied
set

steadfast
steady
telling
unchangeable
unchanging
uncompromising
undeniable
unequivocal
unfailing
unfaltering
unqualified

unquestionable
unshakable
unshaken
unvarying
unwavering
valid
incontestable
unquestioning
for a fact
free from doubt
never-failing

Antonyms

uncertain
unsure
indefinite
variable
unsteady

wobbly
doubtful
dubious
wavering
swerving

doubted
humbled
unconfident
unself-confident

Synonyms
adj inevitable

certain
assured
bound
guaranteed

indisputable
ineluctable
inescapable
infallible

irrevocable
unavoidable
unerring
unfailing

inerrant
surefire

Antonyms

doubting
hesitant
uncertain
indefinite
unsure
variable

unsteady
wobbly
doubtful
dubious
wavering
swerving

doubted
humbled
unconfident
unself-confident

Synonyms
adj reliable, believable

accurate
authentic
authoritative
convincing
credible
dependable
ethical
exact
honest
honorable
kosher

levelheaded
mature
on the level
open
plausible
realistic
responsible
righteous
saintly
secure
sensible

solid
square
steadfast
straight
tried
tried-and-true
true-blue
truthful
unfailing
upright
valid

veracious
principled
true
always there
on up and up
rock solid
there
to be trusted
trustable
up-front

Antonyms

unbelievable
undependable

unreliable
untrustworthy

corrupt

Synonyms
adj constant, permanent

rigid
eternal
immutable
enduring
abiding
changeless

consistent
continuing
equable
even
fixed
imperishable

invariable
lasting
perpetual
same
static
unchanged

unfailing
uniform
unvarying
stabile
unfading
unfluctuating

Antonyms

changeable
ephemeral
transient

changing
inconstant
intermittent

temporary
flexible

Synonyms
adj accurate

certain
exact
faultless
impeccable

infallible
invariable
just
perfect

reliable
sure
trustworthy
unfailing

errorless
true
inerrable
inerrant

Antonyms

erring
imperfect

inaccurate
mistaken

Synonyms
adj steadfast

abiding
bent on
bound
bound and determined
enduring
firm
indefatigable
mulish

persevering
pigheaded
resolute
set
steady
stubborn
sure
tireless

unfailing
unflagging
unflappable
unflinching
unqualified
unswerving
untiring
unwavering

wholehearted
unquestioning
dead set on
going all the way
meaning business
never-failing
stiff-necked

Antonyms

unstable
unsteady

faltering
unsettled

Synonyms
adj persistent

unrelenting
unceasing
indefatigable
unfailing
inexhaustible
unremitting

staunch
tireless
active
assiduous
constant
diligent

dynamic
energetic
fixed
persevering
steady
unfaltering

untiring
unwearied
undeviating
unretiring

Antonyms

tired
weary

changing
inconstant

variable
wavering

Synonyms
adj determined, persevering

constant
continuing
dedicated
devoted
dogged
eager beaver
firm
grind
incessant
indefatigable

indomitable
inexhaustible
jumping
patient
perky
persistent
pertinacious
resolute
staunch
steady

strong
tenacious
tireless
unceasing
unfailing
unfaltering
unflagging
unflinching
unstinted
unswerving

unwavering
unremitting
unwearied
continued
fireball
go-go
hyper
plodding
plugging
undeterred

Antonyms

failing
irresolute

tiring
unpersevering

Synonyms
adj reliable

credible
sensible
ethical
authoritative
authentic
accurate
responsible
convincing
honest
realistic
dependable

mature
believable
upright
honorable
principled
truthful
trusty
all right
exact
kosher
level-headed

open
plausible
righteous
rock
saint
secure
square
steadfast
straight
tried
unfailing

up front
valid
veracious
true
always there
boy scout
down home
fly right
there
true blue
trustable

Antonyms

implausible
improbable
inconceivable
unlikely
unrealistic
dishonest
inaccurate

misleading
untruthful
irresponsible
immature
untrustworthy
unconvincing
lying

unreliable
undependable
incredible
false
doubtful

Synonyms
adj continual

perpetual
constant
around-the-clock
continuous
incessant
unending
ongoing
unbroken
uninterrupted
interminable
relentless

nonstop
endless
ceaseless
connected
consecutive
dateless
enduring
eternal
everlasting
frequent
permanent

persistent
recurrent
regular
repeated
repetitive
running
steady
timeless
unceasing
unchanging
unfailing

unflagging
unremitting
unvarying
aeonian
oft-repeated
persisting
staying
unwaning

Antonyms

transient
interrupted
completed
discontinuous
intermittent

bounded
ending
stopping
terminable
terminating

ceasing
finished
broken
incontinuous

Synonyms
adj sure

abiding
assured
certain
changeless
clear
confident
constant
convinced
convincing
decided
doubtless
enduring

firm
fixed
genuine
incontestable
incontrovertible
indisputable
indubitable
persuaded
positive
real
satisfied
set

steadfast
steady
telling
unchangeable
unchanging
uncompromising
undeniable
unequivocal
unfailing
unfaltering
unqualified
unquestionable

unquestioning
unshakable
unshaken
unvarying
unwavering
valid
for a fact
free from doubt
never-failing

Synonyms
adj continual

ceaseless
unceasing
unflagging
continuous
eternal
persistent
incessant
unending
ongoing
enduring
recurrent

relentless
around-the-clock
connected
consecutive
constant
dateless
endless
everlasting
frequent
interminable
nonstop

permanent
perpetual
regular
repeated
repetitive
round-the-clock
running
steady
timeless
unbroken
unchanging

unfailing
uninterrupted
unvarying
aeonian
oft-repeated
persisting
staying
unwaning

Antonyms

completed
infrequent
changing
discontinuous

intermittent
interrupted
transient
ceasing

ending
finished
stopping

Synonyms
adj tireless

active
eager
energetic
enthusiastic
grind
incessant
indefatigable

industrious
inexhaustible
jumping
perky
persevering
resolute
steadfast

strenuous
unfailing
unflagging
untiring
vigorous
weariless
ball of fire

hard-working
hyper
on the go
unwearying

Synonyms
adj tireless

active
eager
energetic
enthusiastic
grind
incessant
indefatigable

industrious
inexhaustible
jumping
perky
persevering
resolute
steadfast

strenuous
unfailing
unflagging
untiring
unwearied
vigorous
ball of fire

hard-working
hyper
on the go
unwearying