bloody-minded

adjectives

stubbornly obstructive and unwilling to cooperate

"unions...have never been as bloody-minded about demarcation as the shipbuilders"- Spectator

marked by eagerness to resort to violence and bloodshed

"bloody-minded tyrants"; "bloodthirsty yells"; "went after the collaborators with a sanguinary fury that drenched the land with blood"-G.W.Johnson