Wordnet 3.0
ADJECTIVE (1)
1. 
 suspicious or unduly suspicious or fearful of being displaced by a rival; 
- Example: "a jealous lover"[syn: jealous, green-eyed, overjealous]
The Collaborative International Dictionary of English v.0.48:
Overjealous \O`ver*jeal"ous\, a. [Over + jealous. Cf.
   Overzealous.]
   Excessively jealous; too jealous.
   [1913 Webster]
WordNet (r) 3.0 (2006):
overjealous
    adj 1: suspicious or unduly suspicious or fearful of being
           displaced by a rival; "a jealous lover" [syn: jealous,
           green-eyed, overjealous]