/ Dictionary / Index I illogical: Meaning and Definition of Find definitions for: il•log•i•cal Pronunciation: (i-loj'i-kul), [key] — adj. not logical; contrary to or disregardful of the rules of logic; unreasoning: an illogical reply. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: illogical (Thesaurus) illogic illogicality Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language