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improbable (adj.)

1590s, from assimilated form of in- (1) "not, opposite of" + probable, or else from Latin improbabilis. Related: Improbably.

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Definitions of improbable from WordNet

improbable (adj.)
too improbable to admit of belief;
Synonyms: marvelous / marvellous / tall
improbable (adj.)
not likely to be true or to occur or to have occurred;
an improbable event
Synonyms: unlikely
improbable (adj.)
having a probability too low to inspire belief;
Synonyms: unbelievable / unconvincing / unlikely
From wordnet.princeton.edu