Simple Definition of dastardly
: very cruel : using tricks to hurt people
Full Definition of dastardly
1 : cowardly
2 : characterized by underhandedness or treachery <a dastardly attack> <a dastardly villain>
Examples of dastardly
a dastardly attack on innocent civilians
<his dastardly conduct in a critical moment haunted him for the rest of his life>
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