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. from 13th c.
Jealous (adjective)
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 Jehovah, is a jealous God. —Exodus 34:14 (NET)”
Jealous (adjective)
Envious; feeling resentful or angered toward someone for a perceived advantage or success, material or otherwise. from 14th c.
Jealous (adjective)
Suspecting, suspicious.
Zealous (adjective)
Full of zeal; ardent, fervent; exhibiting enthusiasm or strong passion.
Zealous (adjective)
having or showing zeal
“the council was extremely zealous in the application of the regulations”