noun
grudging look; resentful expression
A literary or somewhat formal noun describing a facial expression that shows resentment or a grudge. Not an everyday colloquial word; more likely in written descriptions or elevated speech.
彼は怨色を浮かべて私を見た。
He looked at me with a resentful expression.
その言葉に、彼女の顔に一瞬怨色が走った。
At those words, a flash of resentment crossed her face.