1. Strongly wanting someone else's position, advantages or possessions
   "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
    
3. Protective and suspiciously watchful
   "The Academy keeps jealous watch over the treasures it has accumulated"

See also: desirous, distrustful, wishful

Encyclopedia: Jealous, Possessive