Synonym: doubtful, questionable, unlikely. Antonym: probable. Similar words: improbably, probable, probable cause, probably, probability, imperturbable, impregnable, reprobate. Meaning: [ɪm'prɑbəbl /-'prɒb-] 
adj. 1. not likely to be true or to occur or to have occurred 2. having a probability too low to inspire belief 3. too improbable to admit of belief.
adj. 1. not likely to be true or to occur or to have occurred 2. having a probability too low to inspire belief 3. too improbable to admit of belief. 
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(61) It was somehow both improbable and perfectly logical at the same time.
(62) For just the same reason, it is vanishingly improbable that exactly the same evolutionary pathway should ever be travelled twice.
(63) Carter claims he paid $4000 for the papers, which seems highly improbable.
(64) It seems improbable that America's allies will oppose the proposed arms reduction.
(65) It's improbable that she would have been so successful without famous parents.
(66) There is nothing inherently improbable about the same company producing both and selling them to opposite sides in a war.
(67) It's improbable that a male college would have achieved a similar effect with men or women.
(68) My winning the lottery is improbable, because there are so many sequences of numbers other than mine that could come up.
(69) Instead of a grey flannel suit he now wears a rather improbable pair of designer jeans and a stiffly pressed polo shirt.
(70) With continually varied climbing it proves interesting and improbable to the last.
(71) But it is still highly improbable, a fluke of nature, not a predictable outcome.
(72) Nor did Dorothy quickly shake off a sense of their improbable good fortune.
(73) The claim that he strangled a son of David I in revenge for being blinded is late and seems improbable.
(74) Nevertheless, the Foxton project was mysteriously improbable even if there had been no internal combustion on the way.
(75) They would simply be judged very improbable,(sentencedict.com) the waving statue much more improbable than the lightning.
(76) This account of events certainly fitted the circumstantial evidence, but was seen by the jury as most improbable.
(77) It is improbable that he will come.
(78) It's improbable that she'll accept the invitation.
(79) What is there so improbable in it?
(80) That's an improbable, but not impossible event.
(81) There improbable friends pledged to be blood brothers.
(82) It was caused by an improbable concatenation of circumstances.
(83) Improbable friends pledged to be blood brothers.
(84) It is improbable that she will go.
(85) But it is improbable that this relative gain would mean an absolute gain.
(86) Some people find the coincident events in Hardy's novels annoyingly improbable.
(87) My father loved Pooch for some improbable promise he saw in her. I saw only trouble.
(88) Healing of the tympanum by scaring is improbable if the membrane is totally destroyed by otitis media.
(89) Mr Rice and his factory are an improbable splash of colour on the bleak cityscape.
(90) The immaculately drawn images and historical accuracy permit the artist to move into the realm improbable.
More similar words: improbably, probable, probable cause, probably, probability, imperturbable, impregnable, reprobate, probation, approbation, probationary, improper, improved, improvise, improvised, problem, improvement, improvident, improvisation, impeccable, implacable, impermeable, impalpable, profitable, unimpeachable, acrobat, impress, imprison, probe, imprecise.