noun, noun or participle which takes 'suru', intransitive verb
A somewhat literary or old-fashioned word for jealousy, often implying a grudging or stingy feeling. Can be used as a noun or with する to mean 'to be jealous'.
彼女の成功に悋気を感じる。
I feel jealousy toward her success.
彼は友人
He is jealous of his friend's promotion.