Answer: dastardly

AnswerCrossword Clue
DASTARDLYTreacherous
DASTARDLY"Wacky Races" villain Dick
DASTARDLYWord for villain's deeds
DASTARDLYCowardly
DASTARDLYLike a vaudevillian villain
DASTARDLYUnderhanded prosecutor's appeal ultimately entered late (9)
DASTARDLYMalicious
dastardlyWicked and cruel
dastardlylike a dastard, despicable