English▸ adjective feeling or showing envy of someone or their achievements and advantages:
he grew jealous of her success.
▪ feeling or showing suspicion of someone's unfaithfulness in a relationship:
a jealous boyfriend.
▪ fiercely protective or vigilant of one's rights or possessions:
Howard is still a little jealous of his authority
they kept a jealous eye over their interests.
▪ (of God) demanding faithfulness and exclusive worship.