Definition of dastardly adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈdæstədli//
; NAmE NAmE//ˈdæstərdli//
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evil and cruel a dastardly plot to assassinate the king My first part was Captain O'Hagarty, a dastardly villain in a children's play. Word Originmid 16th cent. (in the sense ‘dull or stupid’): from dastard in the obsolete sense ‘base coward’.
See the Oxford Advanced American Dictionary entry: dastardly