Adverbs for Treacherous

grossly; deliberately; adroitly; vilely; astutely; inscrutably; undoubtedly; infinitely; deeply; darkly; abominably; dangerously; alarmingly; ominously; portentously; slyly; smoothly; insidiously; hypocritically; flatteringly; furtively; cleverly; disloyally; despicably; boldly; hideously; subtly; maliciously.