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Synonyms for wellfounded
adj based on sound reasoning

factual
solid

based on hard data
based on hard facts

proven
rock-solid

substantiated

Synonyms
adj authentic, real

reliable
honest
valid
legitimate
proper

sound
kosher
regular
bona fide
conforming

dependable
genuine
loyal
orthodox
strict

trustworthy
well-founded
true
justified

Antonyms

deceptive
untrustworthy
dishonest
fraudulent
unacceptable
unreal
detestable
unpleasant
evil
immoral
noxious

sinful
vile
incompetent
unskilled
unsuitable
inadequate
tainted
unreliable
fake
forged
inconsequential

inconsiderable
false
invalid
bad
disagreeable
unvirtuous
wicked
rotten
mean
vicious
misbehaving

Synonyms
adj accurate, precise

cogent
correct
exact
faithful
good

normal
proper
regular
right
sound

strict
veracious
well-founded
well-grounded
veridical

true
justified
undistorted

Antonyms

inequitable
unfair
unjust
inaccurate

unjustified
inappropriate
unsuitable
unsuited

partial
imprecise
wrong
unfitting

Synonyms
adj authentic, valid, legal

real
sensible
genuine
fair
normal
certain
consistent
justifiable
natural
logical
statutory
appropriate

reasonable
lawful
proper
well-founded
correct
reliable
rightful
sound
recognized
sanctioned
received
acknowledged

accredited
warranted
authorized
accepted
admissible
canonical
cogent
customary
innocent
just
licit
official

on the level
orthodox
probable
regular
sure
typical
usual
verifiable
true
on the up and up

Antonyms

dishonest
counterfeit
illegitimate
unreal
deceptive
abnormal
unconventional
irrational

unreliable
unsuitable
illegal
incorrect
untrustworthy
unlawful
unwarranted
false

invalid
unreasonable
affected
irregular
uncommon
unfitting
improper

Synonyms
adj certain, definite

sure
solid
reliable
able
confident
easy
stable
strong
sound
established

assured
steady
firm
determined
cinch
balanced
settled
absolute
carefree
conclusive

hopeful
in the bag
resolute
sanguine
self-assured
self-confident
steadfast
sure thing
tried and true
well-founded

shoo-in
reassured
at ease
locked on
nailed down
on ice
unanxious
undoubtful

Antonyms

uncertain
unsure
wobbly
unreliable
untrustworthy
infirm
feeble
unsound
unstable

irresolute
endangered
unprotected
unsafe
indefinite
undecided
soft
delicate
weak

imbalanced
flexible
wavering
insecure
loose
moving
unfastened
unfixed
unsecure

Synonyms
adj logical, reasonable

precise
sensible
satisfactory
wise
fair
solid
reliable
responsible
flawless
valid
rational
proper

accurate
prudent
judicious
correct
right
exact
convincing
deep
sober
satisfying
intellectual
telling

cool
advisable
cogent
consequent
faultless
impeccable
just
levelheaded
orthodox
profound
thoughtful
together

trustworthy
well-advised
well-founded
well-grounded
commonsensical
right-minded
true
all there
got it together
right-thinking

Antonyms

inaccurate
inexact
questionable
senseless
unrealistic
unwise
unacceptable
unsuitable
foolish
unreliable
untrustworthy
irresponsible

unsound
irrational
incorrect
ignorant
excited
incomplete
infirm
illogical
unbelievable
refused
rejected
false

imprecise
careless
unreasonable
flawed
wrong
improper
corrupt
unfit
unhealthy
unfathomable
distrusted

Synonyms
adj constant, fixed; resistant

secure
solid
durable
safe
steady
fast
permanent
calm
balanced
strong
substantial
reliable
lasting

even
established
set
tough
stout
invariable
uniform
firm
abiding
enduring
staunch
sound
stalwart

deep-rooted
equable
immutable
resolute
stationary
steadfast
sturdy
sure
together
unalterable
unchangeable
unvarying
unwavering

well-founded
perdurable
nailed
anchored
stabile
poised
brick-wall
set in stone
solid as a rock
staying put
unfluctuating
well-built

Antonyms

unprotected
unsafe
unstable
intermittent
undependable
unreliable
untrustworthy
vulnerable
impermanent
temporary

ephemeral
unsound
indefinite
changeable
changing
irresolute
inconstant
wobbly
insecure
loose

unfixed
soft
broken
weak
imbalanced
different
flexible
shaky

Synonyms
adj healthy, powerful

firm
heavy
vigorous
secure
tough
capable
solid
big
forceful
able
steady
tenacious

athletic
substantial
stable
active
robust
durable
energetic
able-bodied
enduring
fixed
forcible
hale

hardy
hearty
mighty
muscular
reinforced
rugged
sinewy
sound
stalwart
stark
staunch
stout

strapping
sturdy
unyielding
well-founded
well-made
hard as nails
heavy-duty
in fine feather
well-built

Antonyms

unstable
indefinite
insignificant
unimportant
idle
impotent
inactive
lethargic
fragile
vulnerable
wobbly
unable
intermittent
undependable
untrustworthy
feeble
ineffective

infirm
lazy
sluggish
complacent
irresolute
laid-back
uncaring
indistinct
vague
pale
loose
slack
soft
weak
yielding
moving
little

small
easy
unfixed
delicate
inept
broken
unhealthy
agreeable
easy-going
obscure
mild
moderate
low
unpowerful
mistakable

Synonyms
adj distinct, unmistakable

firm
great
secure
effective
clear
hard
powerful
fast

compelling
potent
formidable
sharp
forceful
stiff
clear-cut
cogent

convincing
influential
marked
mighty
overpowering
persuasive
redoubtable
sound

stimulating
telling
trenchant
urgent
weighty
well-founded
well-established

Antonyms

unstable
indefinite
powerless
ignorant
stupid
uncertain
impotent
incapable
ineffective
indistinct
pleasant
feeble
infirm
complacent

irresolute
laid-back
uncaring
vague
pale
flexible
loose
soft
weak
yielding
moving
insecure
unfixed
dull

easy
mild
nice
slow
unhealthy
agreeable
easy-going
obscure
moderate
delicate
low
unpowerful
mistakable

Synonyms
adj definite; beyond doubt

undeniable
unequivocal
unmistakable
indisputable
self-evident
absolute
accurate
authentic
bona fide
certain
clear
cold

conclusive
dependable
downright
established
faultless
flat
flawless
genuine
incontrovertible
indubitable
irrefutable
manifest

obvious
pat
patent
perfect
positive
real
reliable
superior
sure
undoubted
unimpeachable
veritable

well-founded
well-grounded
incontestable
undisputable
true
down pat
for certain
no ifs ands or buts
sure-enough

Antonyms

disputable
indefinite
uncertain

unsure
vague
questionable

doubtful

Synonyms
adj right, genuine

credible
good
well-founded
solid
authentic
accurate
persuasive
binding
legal
logical
compelling
legitimate

lawful
original
conclusive
authoritative
bona fide
cogent
confirmed
convincing
efficacious
efficient
irrefutable
just

kosher
official
potent
powerful
pure
sound
stringent
strong
substantial
telling
tested
trustworthy

ultimate
unadulterated
weighty
well-grounded
determinative
legit
uncorrupted
true
attested
in force
proven
unanswerable

Antonyms

improbable
unlikely
evil
unreliable
fake
unreal

untrustworthy
counterfeit
illegal
illegitimate
illicit
unlawful

unacceptable
unsound
false
wrong
invalid

Synonyms
adj strong

able
able-bodied
active
athletic
big
capable
durable
enduring
energetic
firm
fixed
forceful

forcible
hale
hardy
hearty
heavy
mighty
muscular
potent
powerful
reinforced
robust
rugged

secure
sinewy
solid
sound
stable
stalwart
stark
staunch
steady
stout
strapping
sturdy

substantial
tenacious
tough
unyielding
vigorous
well-founded
well-made
hard as nails
heavy-duty
in fine feather
well-built