忌 (jì): 嫉妬する

When she saw her colleague get promoted, she couldn't help feeling jealous, but on the surface she still pretended as if nothing had happened.

He resents those who are more successful than him, yet never reflects on whether he himself has worked hard enough.

In a highly competitive environment, she never feels jealous of others' achievements; instead, she humbly learns from their strengths.

Out of jealousy over his friend's new car, he actually deliberately scratched the body of the car, and afterwards he deeply regretted it.