giving offense to moral sensibilities and injurious to reputation; "scandalous behavior"; "the wicked rascally shameful conduct of the bankrupt"- Thackeray; "the most shocking book of its time"
showing the cunning or ingenuity or wickedness typical of a devil; "devilish schemes"; "the cold calculation and diabolic art of some statesmen"; "the diabolical expression on his face"; "a mephistophelian glint in his eye"
playful in an appealingly bold way; "a roguish grin"
not appropriate or proper (or even legal) in the circumstances; "undue influence"; "I didn't want to show undue excitement"; "accused of using undue force"
lacking justification or authorization; "unreasonable searches and seizures"; "desire for undue private profit"; "unwarranted limitations of personal freedom"
in an improper or mistaken or unfortunate manner; "if you think him guilty you judge amiss"; "he spoke amiss"; "no one took it amiss when she spoke frankly"