unbelievable

I

(New American Roget's College Thesaurus)

adj. incredible; unthinkable, unimaginable, farfetched, implausible, impossible. See doubt.

II

(Roget's IV) modif.

Syn. beyond belief, past belief, incredible, inconceivable, staggering, unimaginable, not to be credited, dubious, doubtful, improbable, questionable, implausible, palpably false, unveracious, open to doubt, a bit thick*; see also false 1 , 2 , 3 , unlikely .

Ant. likely*, believable, probable.

III

(Roget's 3 Superthesaurus) a.

beyond belief, incredible, farfetched, suspect, questionable, outlandish, inconceivable, impossible, implausible, doubtful, dubious, improbable, *fishy.

ANT.: believable, credible, conceivable, probable

IV

(Roget's Thesaurus II) adjective 1. Not to be believed: inconceivable, incredible, unimaginable, unthinkable. Idioms: beyond belief, contrary to all reason. See BELIEF. 2. Not plausible or believable: flimsy, implausible, improbable, inconceivable, incredible, shaky, thin, unconceivable, unconvincing, unsubstantial, weak. See LIKELY. 3. So remarkable as to elicit disbelief: amazing, astonishing, astounding, fabulous, fantastic, fantastical, incredible, marvelous, miraculous, phenomenal, prodigious, stupendous, wonderful, wondrous. See GOOD.