/ 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 Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language