A jealous person is someone who is envious of another person's success, possessions, or relationships. Envier is a six-letter word that is used to describe such a person. It is derived from the French verb envier, which means to be jealous or envious. A jealous person may feel resentment or bitterness towards someone else for having something they do not have. They may also be possessive and try to control the other person's behavior. Jealousy can lead to destructive behavior and can damage relationships.