/ Dictionary / Index D dastardly: Meaning and Definition of Find definitions for: das•tard•ly Pronunciation: (das'turd-lē), [key] — adj. cowardly; meanly base; sneaking: a dastardly act. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dastardly (Thesaurus) dastard dastur Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language