/ Dictionary / Index I improbability: Meaning and Definition of Find definitions for: im•prob•a•bil•i•ty Pronunciation: (im-prob"u-bil'i-tē, im"prob-), [key] — pl. -ties the quality or condition of being improbable; unlikelihood. something improbable or unlikely. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: improbability (Thesaurus) imprison improbable Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language