vicious

paheellinen

väkivaltainen

ilkeä

paha violent Violent, destructive and cruel.
savage Savage and aggressive.
(quote-book)|title=http://openlibrary.org/works/OL1519647W “Piracy”: A Romantic Chronicle of These Days|chapter=2/9/1|passage=He had always been remarkably immune from such little ailments, and had only once in his life been ill, of a vicious pneumonia long ago at school. He hadn't the faintest idea what to with a cold in the head, he just took quinine and continued to blow his nose.
puhekieltä Pertaining to vice; characterised by immorality or depravity.
(RQ:Flr Mntgn Essay), Folio Society, 2006, vol.1, p.195:

We may so seize on vertue, that if we embrace it with an over-greedy and violent desire, it may become vicious.