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improbable
adjective
See more 4-syllable adjectives

Divide improbable into syllables:

im · prob · a · ble

How to pronounce improbable:

Definition of improbable:

improbable (adjective):
not likely or probable
unlikely but real or true
unlikely to be true or to occur
not likely to be true or to occur or to have occurred.

Synonyms for improbable:

bizarre
doubtful
dubious
fanciful
far-fetched
flimsy
implausible
impossible
odd
questionable
supposed
unbelievable
uncertain
unlikely

Antonyms for improbable:

assured
certain
clear
confident
doubtless
likely
ordinary
ostensible
plausible
positive
possible
probable
probably
real
reasonable
sanguine
sure
tenable

Other 4-syllable words like improbable

Here are some other common words that have 4 syllables, like improbable does.

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