Princeton's WordNet

1. covetous, envious, jealous(adj)

   showing extreme cupidity; painfully desirous of another's advantages

   "he was never covetous before he met her"; "jealous of his success and covetous of his possessions"; "envious of their art collection"

2. jealous, green-eyed, overjealous(adj)

   suspicious or unduly suspicious or fearful of being displaced by a rival

   "a jealous lover"

Kernerman English Learner's Dictionary

1. jealous(adjective)ˈdʒɛl əs

   feeling unhappy because sb has sth you want

   I was so jealous of my cousin's beautiful hair.

2. jealousˈdʒɛl əs

   feeling angry because sb you love romantically shows interest in sb else

   Her boyfriend looked jealous.; She watched him jealously.

Wiktionary

1. jealous(Adjective)

   Suspecting rivalry in love; troubled by worries that one might have been replaced in someone's affections; suspicious of a lover or spouse's fidelity.

2. jealous(Adjective)

   Protective, zealously guarding, careful in the protection of something one has or appreciates.

3. jealous(Adjective)

   Envious; feeling resentful of someone for a perceived advantage, material or otherwise.

Origin: First coined 1382, jalous, from zelosus, from ζῆλος, from ζηλόω. Cognate to zeal.

Webster Dictionary

1. Jealous(adj)

   zealous; solicitous; vigilant; anxiously watchful

2. Jealous(adj)

   apprehensive; anxious; suspiciously watchful

3. Jealous(adj)

   exacting exclusive devotion; intolerant of rivalry

4. Jealous(adj)

   disposed to suspect rivalry in matters of interest and affection; apprehensive regarding the motives of possible rivals, or the fidelity of friends; distrustful; having morbid fear of rivalry in love or preference given to another; painfully suspicious of the faithfulness of husband, wife, or lover

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