WordWeb Online

1. Showing extreme cupidity; painfully desirous of another's advantages
   "jealous of his success and covetous of his possessions"
   - covetous, envious
    
2. Suspicious or unduly suspicious or fearful of being displaced by a rival
   "a jealous lover"
   - green-eyed, overjealous

See also: desirous, distrustful, jealously, wishful

Encyclopedia: Jealous