bloodthirsty
adj.wanting to see or do violence and bloodshed. You use this to describe someone who enjoys watching or causing fights and injuries.
adj.characterised by a desire for or enjoyment of violence and bloodshed. Often used to describe a person's temperament or a specific event's atmosphere.
“The crowd was bloodthirsty and cheered loudly for the fight.”
“The movie's graphic violence was criticized as bloodthirsty and unnecessary for the plot.”
“The general's reputation as a bloodthirsty leader preceded him, as his previous campaigns were marked by a brutal disregard for civilian safety.”
“To “rile up American men,” as Baer puts it in an interview, they were characterized as heartless, bloodthirsty monsters.”
From blood + thirsty. Cognate with West Frisian bloeddorstich (“bloodthirsty”), Dutch bloeddorstig (“bloodthirsty”), German blutdürstig (“bloodthirsty”), Danish blodtørstig (“bloodthirsty”), Swedish blodtörstig (“bloodthristy”), Norwegian blodtørstig (“bloodthirsty”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.