dastardly

From dastard +‎ -ly.

• (UK) IPA^(key): /ˈdɑːstədli/, /ˈdæstədli/

• Audio (Southern England):

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• (US) IPA^(key): /ˈdæstɚdli/

dastardly (comparative dastardlier, superlative dastardliest)

1. In the manner of a dastard; marked by cowardice; pusillanimous.
   • 1941 December 8, President Franklin D. Roosevelt, 6:42 from the start, in Day of Infamy Speech‎^[1], Washington, D.C.:

     I ask that the Congress declare, that since the unprovoked and dastardly attack by Japan on Sunday, December 7th, 1941, a state of war has existed between the United States and the Japanese Empire.

2. Treacherous; given to backstabbing.

• "the unprovoked and dastardly attack by Japan on...December 7th" - Franklin D. Roosevelt in response to the attack on Pearl Harbor (1941)

dastardly

1. In a cowardly or treacherous fashion.