/ Dictionary / Index M malicious: Meaning and Definition of Find definitions for: ma•li•cious Pronunciation: (mu-lish'us), [key] — adj. full of, characterized by, or showing malice; malevolent; spiteful: malicious gossip. vicious, wanton, or mischievous in motivation or purpose. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: malicious (Thesaurus) malice aforethought malicious mischief Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language