Prone to strong jealousy; having a highly jealous personality (often applied to romantic or close relationships).
彼はとても嫉妬深いので、連絡が遅れるだけで不機嫌になる。
He is very jealous, so he gets upset if messages are late.
嫉妬深い性格が原因で友人関係がぎくしゃくしてしまった。
A jealous personality caused the friendship to become strained.
嫉妬深い人は相手の小さな言動にも敏感に反応することが多い。
Jealous people often react sensitively to small actions or words of their partner.