celoso
/θeˈloso/ · A2 · adj
jealous
celoso = celo (zeal) + -oso (full of): jealous and zealous are one word
From Latin zelosus, from Greek zelos (fervor). English split it into two words, zealous and jealous; Spanish kept one. Celoso de su mujer = jealous; celoso de su trabajo = zealous, protective of it.