Dastardly means doing something evil, wicked or cruel, but mostly refers to evil or wicked, any such act. Deeds refers to acts. Therefore dastardly deeds simply means evil or wicked acts.
Although it looks like an adverb, it is usually an adjective meaning villainous.
Characterized by treachery
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the two types of definition are the formal and informal definition.
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Dick Dastardly was created in 1968.
When it came to politics, he was a dastardly man who would lie about and smear his opponents without hesitation. Dastardly is an adjective.
the villain was dastardly in his evil deeds to capture the world
"Wacky Races" and "Dastardly and Muttley in Their Flying Machines" .
His dastardly crimes put him on the FBI's "Top Ten" list.
http://www.comedy-zone.net/cartoons/characters/dastardly-and-muttley.htm
The cast of Dastardly and Muttley in Their Flying Machines - 1969 includes: Don Messick as Muttley Paul Winchell as Dick Dastardly
Dastardly Darlings - 2014 was released on: USA: 1 August 2014 (limited)
Dick Dastardly , "Curses! - foiled again!" , never caught 'Yankee Doodle' the pigeon .
cowardly but sneaky
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Dastardly and Muttley in Their Flying Machines - 1969 was released on: USA: 13 September 1969