Definition of jealous adjective from the Oxford Advanced American Dictionary

      

    jealous

     adjective
    adjective
    NAmE//ˈdʒɛləs//
     
     
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  1. 1feeling angry or unhappy because someone you like or love is showing interest in someone else a jealous wife/husband He's only talking to her to make you jealous.
  2. 2jealous (of somebody/something) feeling angry or unhappy because you wish you had something that someone else has synonym envious She's jealous of my success. Children often feel jealous when a new baby arrives.
  3. 3jealous (of something) wanting to keep or protect something that you have because it makes you feel proud They are very jealous of their good reputation (= they do not want to lose it).
 
adverb She eyed Natalia jealously. a jealously guarded secret
See the Oxford Advanced Learner's Dictionary entry: jealous