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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(91) If Popper is right, scientific theories are not only equally unprovable but also equally improbable.
(92) Alternatively, its "Top Ten Bunk Off Ideas" included such improbable excuses as: "I will be late for work today because I have to pick my uncle up from the train station.
(93) The U of O is infamous for its inhumanely cramped dorm rooms, though, making it improbable that one resident could have committed such an act without the other being intimately aware.
(94) When the sky is blue , it is improbable that it will rain.
(95) A panoramic scene in the movie includes the improbable sight of ships marooned on a highway.
(96) They presume government take step coping with situation but opinion highly improbable.
(97) Sleepwalker: A Sleeper who is not Awake but who does not suffer from Quiescence and Disbelief, and who does not increase the chance of a Paradox should he witness vulgar or improbable magic.
(98) An improbable sort of barque, but at least it floats.
(99) We must make one of two following highly improbable suppositions.
(100) The reporting from our various diplomatic posts converged on the proposition that the war was improbable.
(101) Though given the actor's almost unrecognisable appearance this week when he made a rare public outing,(www.Sentencedict.com) perhaps the joke that he can't even land the role of himself might not seem so improbable.
(102) It seems improbable that this year's figure will fall much below last year's 75,000.
(103) It is the result of a cutting-edge computational process and people's responses to it are just as improbable.
(104) Or it could mean one more thing - as improbable, but it was far more sinister plot.
(105) It may sound improbable, given the junk-food associations once attached to the man's name, but few phrases are more bankable to restaurants around the world than this: “Bill Clinton ate here.
(106) Picking the right six numbers in a lotto is, to say the least, statistically improbable.
(107) Political action – real, determined and concerted action – seems again improbable.
(108) Ofcom admits that without new powers a shared network across the entire country is improbable, although some companies are already taking voluntarily steps to merge networks.
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.