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“zealous” in Latin

The English word zealous itself goes back to Latin zēlus, through zēlōsus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

zealous
studiosus (always with a genitive of that on which one’s zeal is bestowed): acer (sharp, fiery, etc.): ardens (burning): vehemens (violent). A zealous patriot, civis acerrimus: to have a zealous desire for anything, alicujus rei desiderio incensum esse or flagrare.

Quick answer

What is the Latin word for zealous?
The usual Latin words for “zealous” are studiōsus, ācer, ārdeō; also vehemēns, flagrō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.