dastardly
adjective
UK/ˈdæs.təd.li/
US/ˈdæs.tɚd.li/
Definitions of dastardly adjective
Extremely wicked and cruel, often in a cowardly way.
The villain plotted a dastardly scheme to steal the company's assets.
They committed a dastardly crime by betraying their closest friends.
The dictator was infamous for his dastardly acts against his own people.