noun
enmity; grudge; deep-seated resentment
A strong, lingering ill will or hatred, often with a desire for revenge. More intense and literary than 恨み (うらみ).
彼は長年の怨恨から復讐を誓った。
He swore revenge out of years of deep-seated resentment.
二人の間には深い怨恨がある。
There is deep enmity between the two.