An unpleasant emotion of suspicion, insecurity, or fear that arises from the possibility of losing the affection, attention, or loyalty of someone valued, especially in a romantic relationship.

A flash of jealousy shot through him when he noticed his partner dancing with a stranger.

Resentful envy of another person's advantages, achievements, or possessions.

There was obvious jealousy in her voice when she spoke about her colleague's promotion.

(Archaic or literary) Vigilant guarding or protective zeal over something one possesses or esteems.

He defended the independence of his country with a fierce jealousy.