Definitions for: Improbable

[adj] too improbable to admit of belief; "a tall story"
[adj] not likely to be true or to occur or to have occurred; "legislation on the question is highly unlikely"; "an improbable event"
[adj] having a probability to low to inspire belief

Webster (1913) Definition: Im*prob"a*ble, a. [L. improbabilis; pref. im- not +
probabilis probable: cf. F. improbable. See Probable.]
Not probable; unlikely to be true; not to be expected under
the circumstances or in the usual course of events; as, an
improbable story or event.

He . . . sent to Elutherius, then bishop of Rome, an
improbable letter, as some of the contents discover.
-- Im*prob"a*ble*ness, n. -- Im*prob"a*bly, adv.

Synonyms: implausible, incredible, marvellous, marvelous, supposed(a), tall(a), unbelievable, unconvincing, unlikely

Antonyms: likely, plausible, probable

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