vicious
[ˈviSHəs]
ADJECTIVE
deliberately cruel or violent.
"a vicious assault"
synonyms:
brutal · ferocious · savage · violent · dangerous · ruthless · remorseless · [more]
(of an animal) wild and dangerous to people.
"the dog was vicious and likely to bite"
synonyms:
ferocious · savage · wild · feral · untamed · undomesticated · [more]
serious or dangerous.
"a vicious flu bug"
literary
immoral.
"every soul on earth, virtuous or vicious, shall perish"
synonyms:
immoral · debauched · dissolute · abandoned · perverted · degenerate · [more]
archaic
(of language or a line of reasoning) imperfect; defective.
..but they stick together.