Zealous a. : Filled with, or characterized by, zeal; warmly engaged, or ardent, in behalf of an object.

Zealous a. : Filled with religious zeal.

Example:
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zeal, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, glossary, english, language, ESL, adjective, partisanship, missionaries, ly, adverb, ness, Definition of zealous, Unabridged Dictionary.

Defination from the web:
zealous from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... filled with or characterized by zeal : marked by fervent partisanship for a person, a cause, or an ideal <zealous missionaries> — zeal·ous·ly adverb ...