scur·ri·lous 
(skûrə-ləs, skŭr-)
(skûrə-ləs, skŭr-)adj.
1. Given to the use of vulgar, coarse, or abusive language.
2. Expressed in vulgar, coarse, or abusive language.
3. Of a malicious or slanderous nature; defamatory: "The law affords them wide First Amendment protection ... even when they write scurrilous lies" (Richard Curtis).
scurri·lous·ly adv.
scurri·lous·ness n.