- 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. [from 13th c.]
- Suspecting, suspicious.
- Envious; feeling resentful of someone for a perceived advantage, material or otherwise. [from 14th c.]
- Protective, zealously guarding, careful in the protection of something one has or appreciates. [from 14th c.]
"For you must not worship any other god, for the Lord, whose name is Jealous, is a jealous God. —Exodus 34:14 (NET)"