vicious

Violent, destructive and cruel.

Savage and aggressive.

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.

Pertaining to vice; characterised by immorality or depravity.

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

Admiral Crawford was a man of vicious conduct, who chose, instead of retaining his niece, to bring his mistress under his own roof

A surname.