The Collaborative International Dictionary of English v.0.48:

Fervid \Fer"vid\, a. [L. fervidus, fr. fervere. See Fervent.]
   1. Very hot; burning; boiling.
      [1913 Webster]

            The mounted sun
            Shot down direct his fervid rays.     --Milton.
      [1913 Webster]

   2. Ardent; vehement; zealous.
      [1913 Webster]

            The fervid wishes, holy fires.        --Parnell.
      -- Fer"vid*ly, adv. -- Fer"vid*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fervidly
    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:

29 Moby Thesaurus words for "fervidly":
   ardently, breathlessly, cordially, devotedly, devoutly, earnestly,
   enthusiastically, excitedly, exuberantly, fervently, feverishly,
   glowingly, heart and soul, heartily, heatedly, hotly,
   impassionedly, intensely, intently, keenly, kindly, passionately,
   perfervidly, seriously, sincerely, vehemently, vigorously, warmly,
   zealously