adjective

improbable

improbable, unlikely, doubtful

It seems improbable that he will win the election.

It seems improbable that he will win the election.

She told an improbable story about meeting a ghost.

She told an improbable story about meeting a ghost.

((adjective)) unlikely to be true or to happen It seems improbable that he will win.

Synonyms: unlikely, doubtful, questionable; Antonyms: probable, likely, certain

From the prefix 'im-' (not) and 'probable' (likely). It literally means 'not probable'.

Break it down: 'im-' means 'not'. So, 'improbable' is simply 'not probable', or not likely to happen.

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