1. feeling or showing envy of someone or their achievements and advantages
2. feeling or showing suspicion of someone’s unfaithfulness in a relationship
3. fiercely protective or vigilant of one’s rights or possessions

Examples

• She was jealous of her sister’s success in school.
• He became jealous when he saw his girlfriend talking to another man.
• The company is jealous of its reputation and guards it carefully.
• I’m jealous of people who can speak multiple languages fluently.
• His jealous behavior was damaging their relationship.
• The nation was jealous of its sovereignty and independence.
• She felt jealous watching her friends go on vacation without her.