improbable

[ im-prob-uh-buhl ]
/ ɪmˈprɒb ə bəl /

adjective

not probable; unlikely to be true or to happen: Rain is improbable tonight.

Origin of improbable

From the Latin word improbābilis, dating back to 1590–1600. See im-2, probable
Related forms
Can be confusedimpossible impracticable impractical improbable
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for improbable

improbable

/ (ɪmˈprɒbəbəl) /

adjective

not likely or probable; doubtful; unlikely
Derived Formsimprobability or improbableness, nounimprobably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for improbable

improbable


adj.

1590s, from assimilated form of in- (1) "not, opposite of" + probable, or else from Latin improbabilis. Related: Improbably.

Online Etymology Dictionary, © 2010 Douglas Harper