Rancor is a bitter and long lasting hatred.
An example of rancor is how Lex Luthor feels about Superman.
a continuing and bitter hate or ill will; deep spite or malice
Brit. sp. ran′cour
Origin of rancorMiddle English rancour from Old French rancor from LL, rankness, in LL(Ec), rancor from Classical Latin rancere, to be rank
Bitter, long-lasting resentment; deep-seated ill will: He was filled with rancor after losing his job.
Origin of rancorMiddle English from Old French from Late Latin rancid smell from Latin rancēre to stink, be rotten