Rancorous

ˈræŋkərəs

adjective

showing deep-seated resentment or ill will; characterized by bitterness or malice

The word 'rancorous' is derived from the Latin word 'rancor,' which means bitterness or resentment. It is often used to describe feelings or actions that are motivated by deep-seated animosity or hostility.

While he tried to decide on the best way to approach his request, the goblin broke the silence.“You buried the elf,” he said, sounding unexpectedly rancorous.

J. K. Rowling

Harry Potter and the Deathly Hallows

The two books of Kings, besides the history of Saul, David, and Solomon, who reigned over all Israel, contain an abstract of the lives of seventeen kings, and one queen, who are styled kings of Judah; and of nineteen, who are styled kings of Israel; for the Jewish nation, immediately on the death of Solomon, split into two parties, who chose separate kings, and who carried on most rancorous wars against each other.

Thomas Paine

The Age of Reason

It would, at least, deliver them from those rancorous and virulent factions which are inseparable from small democracies, and which have so frequently divided the affections of their people, and disturbed the tranquillity of their governments, in their form so nearly democratical.

Adam Smith

The Wealth of Nations