/ Dictionary / Index U unreasoning: Meaning and Definition of Find definitions for: un•rea•son•ing Pronunciation: (un-rē'zu-ning), [key] — adj. not reasoning or exercising reason; reasonless; thoughtless; irrational: an unreasoning fanatic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unreasoning (Thesaurus) unreasonable unreconstructed Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language