/ Dictionary / Index M misdemean: Meaning and Definition of Find definitions for: mis•de•mean Pronunciation: (mis"di-mēn'), [key] — v.t. Rare. to misbehave (oneself&hasp;). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: misdemean (Thesaurus) misdeem misdemeanant Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language