vicious

adjective

1. 1

   marked by deep ill will; deliberately harmful

   poisonous hate

   venomous criticism

2. 2

   (of persons or their actions) able or disposed to inflict pain or suffering

   a barbarous crime

   brutal beatings

3. 3

   bringing or deserving severe rebuke or censure

   a criminal waste of talent

   a deplorable act of violence

4. 4

   having the nature of vice