vicious [ˈvɪʃəs]
adj
1. wicked or cruel; villainous a vicious thug
2. characterized by violence or ferocity a vicious blow
3. Informal unpleasantly severe; harsh a vicious wind
4. characterized by malice vicious lies
5. (esp of dogs, horses, etc.) ferocious or hostile; dangerous
6. characterized by or leading to vice
7. invalidated by defects; unsound a vicious inference
8. Obsolete noxious or morbid a vicious exhalation