How to Say "zealous" in Spanish
The most common Spanish word for “zealous” is “ardiente” — use 'ardiente' when 'zealous' refers to a passionate, burning desire or fervor, often related to ambition or strong emotion..
ardiente
ar-DYEN-teh/aɾˈðjen.te/

Examples
Mostró un deseo ardiente de ganar la competencia.
He showed a zealous/passionate desire to win the competition.
Ella es una defensora ardiente de los derechos humanos.
She is a fervent/passionate defender of human rights.
Gender Invariable
This adjective always ends in '-e', meaning it describes both masculine nouns (deseo ardiente) and feminine nouns (pasión ardiente) without changing.
celoso
seh-LOH-soh/seˈloso/

Examples
Es un celoso guardián de la ley y el orden.
He is a zealous/vigilant guardian of law and order.
El comité fue celoso en la protección de los fondos.
The committee was vigilant in the protection of the funds.
Formal Context
This meaning is almost always used when describing someone's dedication to a job, duty, or belief, rather than a personal relationship.
Confusing 'ardiente' and 'celoso'
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