Breadcrumb Home > Dictionary > Index D dud: Meaning and Definition of Find definitions for: dud Pronunciation: (dud), [key] — n. a device, person, or enterprise that proves to be a failure. a shell or missile that fails to explode after being fired. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dud (Thesaurus) ductwork duddy TrendingHere are the facts and trivia that people are buzzing about. The Book of 1 Corinthians: Summary Current Events This Week: June 2023 Languages Spoken in Each Country of the World Aesop's Fables: Aesop's Fables Milestones in Environmental Protection The 12 Labors of Hercules (In Order) ✖ Related Content Daily Word Quiz: soupon Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language