The correct spelling is vicious.
stop visciously slandering me pro!
I didn't use the word this time, but...
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
[C14: from Old French vicieus, from Latin vitiōsus full of faults, from vitium a defect]
viciously
— adv
viciousness
— n
...one look at your posts, and the shoe definitely fits.
Malice, slander, and deliberate misrepresentation seem as natural to you as breathing.