ljubomora

1. jealousy
   Njegova ljubomora je uništila njihovu vezu. — His jealousy destroyed their relationship.
   Pozelenela je od ljubomore kad ga je videla s drugom. — She turned green with jealousy when she saw him with another woman.
2. envy; jealousy
   Kolege nisu krile ljubomoru zbog njegovog unapređenja. — His colleagues didn't hide their envy over his promotion.

The adjective is ljubomoran na koga — jealous of someone.