knavish Synonyms

tricksy tricky sly foxy slick guileful cunning dodgy wily crafty reprobate roguish scampish shady shifty shameful unethical treacherous unprincipled leprechaunish dishonourable impish untrustworthy criminal wicked villainous untruthful unscrupulous rascally puckish perfidious dishonest disgraceful dirty deceitful dastardly crooked corrupt circumventive chanceful blackguardly disreputable evil mischievous mendacious lying jadish immoral hollow-hearted fraudulent