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Definition of zealous : 1. Filled with religious zeal.
2. Filled with, or characterized by, zeal; warmly engaged, or ardent, in behalf of an object.

Synonyms:

impetuous, gung ho, yearning, intense, anxious, concern, longing, importunate, greedy, glowing, warm, nuts, crazy, great, devouring, hot, keen, impatient, mad, avid, rabid, esurient, desirous, vehement

snappy, forceful, spunky, vivacious, fervid, mighty, effervescent, driven

indefatigable, inexorable, persevering, committed, resolute, determined, fearless, unbending, persistent, ruthless, bold, tenacious, unyielding, tireless, valiant, unwavering, dedicated, unchangeable, courageous, deliberate, decided, true, decisive, tough, indomitable, implacable, devoted, reliable, loyal, strong-minded, unflinching, relentless, diligent, steadfast, stern, strong-willed, bullheaded, faithful, stubborn, thorough, steely, constant, intent, plucky, headstrong, willing, steady, serious, unshakeable, uncompromising, firm, dogged, resolved, iron-willed, set, dauntless, insistent, staunch

exuberant, emphatic, burning, puissant, earnest, full-blooded, animated, frisky, mettlesome, peppy, lusty, spirited, fervent, zestful, fiery, hearty, agitated, afire, energetic, powerful, prolific, enthusiastic, passionate, virile, impassioned, zippy, sprightly, strenuous, strong, eager, industrious, vigorous, potent, lively, active, ardent, excited, ablaze

fanatical

Usage examples:

• Nicholas Amsdorf, the intimate and trusted friend of Luther, was among the most zealous of the opponents of Majorism. - "Historical Introductions to the Symbolical Books of the Evangelical Lutheran Church", Friedrich Bente.
• A gentleman who lately studied here, and who is now a most efficient and zealous minister of the Church, speaks in very favourable terms of the judicious arrangement which has latterly marked the theological course at St. Bees; and improvements still more decided, it appears, are in contemplation under its present administration. - "The Ports, Harbours, Watering-places and Picturesque Scenery of Great Britain Vol. 1", William Finden.
• Now are you more zealous than honest, boy. - "Helmet of Navarre", Bertha Runkle.