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1. Envious or resentful of the good fortune or achievements of another: I felt jealous when my coworker got a promotion.
2. Fearful or wary of losing one's position or situation to someone else, especially in a sexual relationship: Her new boyfriend was jealous of her male friends.
3. Having to do with or arising from feelings of envy, apprehension, or bitterness: jealous thoughts.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.