Breadcrumb Home > Dictionary > Index M madcap: Meaning and Definition of Find definitions for: mad•cap Pronunciation: (mad'kap"), [key] — adj. wildly or heedlessly impulsive; reckless; rash: a madcap scheme. —n. a madcap person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: madcap (Thesaurus) Madariaga MADD TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: parallax Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language