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What is another word for extremely doubtful?

Need synonyms for extremely doubtful? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Not likely to be true or to happen
inconceivable
incredible
unbelievable
implausible
improbable
unlikely
unimaginable
fantastic
unconvincing
unthinkable
impossible
extraordinary
preposterous
fantastical
staggering
incredulous
absurd
weak
uncompelling
unconceivable
rare
ridiculous
thin
unsubstantial
unimagined
incogitable
strange
incomprehensible
ludicrous
reachy
phoneyUK
phonyUS
unknowable
insupposable
imcomprehensible
mind-boggling
mind-blowing
beyond belief
hard to swallow
unheard-of
scarcely credible
out of the question
full of it
won't wash
extremely implausible
extremely unlikely
beyond reason
extremely difficult to believe
won't fly
not in the least likely
beyond the bounds of possibility
not to be thought of
indescribable
ineffable
unutterable
unspeakable
inexpressible
indefinable
nameless
incommunicable
uncommunicable
undefinable
inenarrable
undescribable
beyond words
indefinite
unheard of
impalpable
intangible
unanalysableUK
unanalyzableUS
defying description
beyond description
sublime
beggaring description
singular
amazing
astonishing
astounding
exceptional
untellable
nondescript
elusive
breathtaking
outrageous
wonderful
fabulous
marvelousUS
abstract
unique
preternatural
marvellousUK
obscure
beyond the realm of reason
awesome
stupendous
wondrous
remarkable
stunning
overwhelming
prodigious
unspecified
unspecifiable
miraculous
phenomenal
spectacular
striking
surprising
portentous
awful
subtle
undreamed of
not on
highly unlikely
unusual
eye-opening
unachievable
unattainable
outlandish
unworkable
uncommon
unobtainable
hopeless
impracticable
unordinary
unrealizable
untold
unsuitable
impressive
unacceptable
undreamed-of
indistinct
unthought of
not worth considering
outstanding
not feasible
beyond one
incalculable
incorporeal
beyond one's wildest dreams
confounding
bewildering
awe-inspiring
not remotely possible
hard to define
hard to describe
unreasonable
illogical
inexpressable
unexpressible
beyond possibility
doubtful
unfamiliar
unprecedented
tremendous
unknown
novel
inapprehensible
new
original
extravagant
immense
eye-popping
legendary
fresh
amazeballs
rad
unaccustomed
not understandable
undiscovered
unsung
unexampled
out-of-this-world
unrenowned
extreme
top drawer
ground-breaking
little known
little-known
never before encountered
“In a city where almost roadside bin is overflowing with uncleared garbage, it's extremely doubtful whether the authorities will be successful in implementation.”
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Nearby Words
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extremely enthusiastic
extremely familiar
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extremely difficult to believe
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extremely cold
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extremely careful
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