Bloodthirsty

1. Thirsty for blood: inexorably violent or eager for bloodshed; murderous. Synonyms: bloodlusty, homicidal, (archaic) murtherous, murderousAntonym: unbloodthirsty
2. Of a book, film, etc.: depicting much violence; gory, violent.
3. (humorous) Of a mosquito, tenaciously seeking to draw blood.