Definition of dastardly
- a dastardly attack
- a dastardly villain
a dastardly attack on innocent civilians
his dastardly conduct in a critical moment haunted him for the rest of his life
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'dastardly.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: very cruel : using tricks to hurt people
Thesaurus: All synonyms and antonyms for dastardly
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