ревностен означава в английски

jealous▼(protective, guarding; careful in the protection of something one has or appreciates)
adjective
[UK: ˈdʒe.ləs] [US: ˈdʒe.ləs]

keen [keener, keenest]▼(showing a quick and ardent responsiveness or willingness)
adjective
[UK: kiːn] [US: ˈkiːn]

zealous▼(full of zeal; ardent)
adjective
[UK: ˈze.ləs] [US: ˈze.ləs]