Pronunciation: ( jel'us),[key] —adj. 1. feeling resentment against someone because of that person's rivalry, success, or advantages (often fol. by of): He was jealous of his rich brother. 2. feeling resentment because of another's success, advantage, etc. (often fol. by of): He was jealous of his brother's wealth. 3. characterized by or proceeding from suspicious fears or envious resentment: a jealous rage; jealous intrigues. 4. inclined to or troubled by suspicions or fears of rivalry, unfaithfulness, etc., as in love or aims: a jealous husband. 5. solicitous or vigilant in maintaining or guarding something: The American people are jealous of their freedom. 6. Bible.intolerant of unfaithfulness or rivalry: The Lord is a jealous God.