恨

resentment

deep regret

grudge of ten years' standing

sensibility

regrettable matter

grudge

reproachfully

many regrets

Song of Everlasting Sorrow (poem by Bai Juyi)

personal grudge

grudge

grudge match

old grudge

to blame oneself

to incur someone's enmity

grudge

being resented (by someone one holds resentment towards)

extreme regret

old grudge

one-sided grudge

song with lyrics about resentment and a sorrowful tune

to avenge oneself

regret

to have a deep grudge

with no hard feelings

reproachful

I regret that

pent-up resentment

reproachful

hard feelings

curse you

enmity

to bear a grudge against