bloodthirsty

Thirsty for blood: inexorably violent or eager for bloodshed; murderous.

[I]t is, as I may ſo ſay, a ſavvcy Plot: and vve all knovv, moſt Reverend Fathers, that vvhat is ſavvce for a Gooſe is ſavvce for a Gander: Therefore, I ſay, as thoſe bloud-thirſty Ganders of the conſpiracy vvould have deſtroyed us Geeſe of the Senate, let us make haſte to deſtroy them, ſo I humbly move for hanging— […]

[…] Diodorus also relates of Caligula, predecessor to Nero, that his nurse used to moisten the nipples of her breast frequently with blood to make Caligula take the better hold of them; which, says Diodorus, was the cause that made him so blood-thirsty and cruel all his life-time after, that he not only committed frequent murder by his own hand, but likewise wished that all human kind wore but one neck that he might have the pleasure to cut it off.

Of a book, film, etc.: depicting much violence; gory, violent.

[T]here has been recently a tendency on the part of some Education Authorities to select these manifestly worthy portions exclusively, and to avoid reading the more archaic and, so to speak, bloodthirsty books, such as Judges, Kings, and Genesis, altogether.

Of a mosquito, tenaciously seeking to draw blood.

For, whether they were attracted by the lantern, or by the unaccustomed smell of a white man for which they had been waiting for the last thousand years or so, I know not; but certainly we were presently attacked by tens of thousands of the most blood-thirsty, pertinacious, and huge mosquitoes that I ever saw or read of.