jealous

zelosus (Late Latin)

jalous (Old French)

Eager; zealous. Jealous.

gelus (Middle English)

jealous (English)

Envious; feeling resentful or angered toward someone for a perceived advantage or success, material or otherwise. [from 14th c.]. Protective, zealously guarding, careful in the protection of something one has or appreciates. [from 14th c.]. 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. [...]