He never forgave me for the way I had injured him: that rancor towards me never died.
rancor rancoris (rancidness, a stinking smell, grudge, bitterness) (Latin)
RANCOR: RANKER! Most of the students always hate the top RANKER of the class, as they always defeat them in the exams! r+ancor. (rhymes like ANGER. ). so you have developed ANGER OR HATRED FOR YOUR FRIEND.