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Definition of fervent : 1. Hot; glowing; boiling; burning; as, a fervent summer.
2. Warm in feeling; ardent in temperament; earnest; full of fervor; zealous; glowing.

Synonyms:

piping hot, charged, study at passionate, flaming, keen, incandescent, roasting, feelings, boiling, perfervid, red, gung ho, dithyrambic, warm-blooded, passional, ultrahot, religious, vehement, intense, blazing, white-hot, intent, importunate, searing, sweltering, rabid, impetuous, crazy, heated, nuts, desirous, yearning, scalding, red-hot, scorching, cordial, mad, emotional, warm, broiling, hot, demonstrative, impatient, torrid, hot-blooded, sultry, igneous, fervid, longing, concern, superheated, glowing, sincere

fanatical, hooked, born-again, avid, mad about something, wholehearted, motivated

flintlike, diligent, decisive, stony, devoted, indomitable, courageous, indefatigable, plucky, spunky, persistent, strong-willed, hard, undaunted, headstrong, insistent, bullheaded, bulldogged, dogged, steadfast, stiff, enduring, resolute, true, obdurate, unflagging, stubborn, tenacious, tireless, determined, obstinate, tough, staunch, persevering, brave, dauntless, faithful, bold

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

energized, exhilarated, anxious, attentive, effervescent, aroused, electrified, disturbed, breathless, inflamed, disquieted, stimulated, turbulent, feverish

Usage examples:

• This slow progress was very fatiguing, increased by the fine dust, dried by the summer heats, which rose in thick clouds at every step the animals took; there was also scarce a breath of air, the fervent rays of the sun shining with uninterrupted force on their heads. - "The Prime Minister", W.H.G. Kingston.
• When she stood under the sign of the Three Holy Kings, where dwelt Farina's mother, she put up a fervent prayer of thanks, and breathed freely. - "The Short Works of George Meredith", George Meredith Last Updated: March 7, 2009.
• " Love you have, sweet; you have mine- the fervent, true, honest, deep love of my heart and soul. - "Wife in Name Only", Charlotte M. Braeme (Bertha M. Clay).