The Collaborative International Dictionary of English v.0.48:

Fervent \Fer"vent\, a. [F. fervent, L. fervens, -entis. p. pr.
   of fervere o the boiling hot, to boil, glow.]
   1. Hot; glowing; boiling; burning; as, a fervent summer.
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            The elements shall melt with fervent heat. --2 Pet.
                                                  iii. 10.
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   2. Warm in feeling; ardent in temperament; earnest; full of
      fervor; zealous; glowing.
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            Not slothful in business; fervent in spirit. --Rom.
                                                  iii. 11.
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            So spake the fervent angel.           --Milton.
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            A fervent desire to promote the happiness of
            mankind.                              --Macaulay.
      -- Fer"vent*ly, adv. -- Fer"vent*ness, n.
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            Laboring fervently for you in prayers. --Col. iv.
                                                  12.
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WordNet (r) 3.0 (2006):

fervently
    adv 1: with passionate fervor; "both those for and against are
           fervently convinced they speak for the great majority of
           the people"; "a fierily opinionated book" [syn:
           fierily, fervently, fervidly]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "fervently":
   ardently, assiduously, breathlessly, cordially, devotedly,
   devoutly, diligently, earnestly, effectively, eloquently,
   energetically, enthusiastically, excitedly, expressively,
   exuberantly, fervidly, feverishly, fluently, forcefully, glibly,
   glowingly, graphically, heart and soul, heartily, heatedly, hotly,
   impassionedly, impressively, in glowing terms, indefatigably,
   industriously, intensely, intently, keenly, kindly, laboriously,
   meaningfully, passionately, perfervidly, powerfully, relentlessly,
   sedulously, seriously, sincerely, smoothly, spiritedly,
   strenuously, strikingly, tellingly, tirelessly, unsparingly,
   vehemently, vigorously, vividly, warmly, zealously