Rancor

Rancor

<rank-ker>

hate; spite; grudge;

having a long-lasting bitterness for someone.

His rancor became friendship after he got to know her.

Memory trick:
rancor reminds of ran
we ran because we did not like them

At work:
I can work with him. I feel no rancor because I understand why he did those bad things

(c) 2015 E. Carruthers