sanguineous
Accompanied by bloodshed; bloody.
[F]or swinging of incense-pans and Eighty-three Departmental Banners, we have waving of the one sanguineous Drapeau Rouge [red flag].
Eager for bloody violence; bloodthirsty.
Resembling or constituting blood.
Where it comes from
Adapted borrowing of Latin sanguineus + -ous. Doublet of sanguine.
Adapted from the Wiktionary entry sanguineous (CC BY-SA 4.0).