adjective
1.
too extraordinary or improbable to admit of belief
an incredible story of privations overcome
Synonyms: incogitable, inconceivable, insupposable, unbelievable, unimaginable, unthinkable
Related Word: absurd, outlandish, preposterous, ridiculous; impossible, untenable
Idioms: beyond belief, out of the question
Contrasted words: acceptable, believable, conceivable, likely, plausible, reasonable
Antonyms: credible
2.
Synonyms: implausible , flimsy, improbable, inconceivable, thick, thin, unbelievable, unconvincing, unsubstantial, weak
Antonyms: credible