FERVIDLY

fierily, fervently, fervidly

(adverb) with passionate fervor; “both those for and against are fervently convinced they speak for the great majority of the people”; “a fierily opinionated book”

Source: WordNet® 3.1

Etymology

Adverb

fervidly (comparative more fervidly, superlative most fervidly)

In a fervid manner.

Source: Wiktionary

FERVID

Fer"vid, a. Etym: [L. fervidus, fr. fervere. See Fervent.]

1. Very hot; burning; boiling. The mounted sun Shot down direct his fervid rays. Milton.

2. Ardent; vehement; zealous. The fervid wishes, holy fires. Parnell.

– Fer"vid*ly, adv.

– Fer"vid*ness, n.

Source: Webster’s Unabridged Dictionary 1913 Edition