Wordnet 3.0
ADVERB (1)
1. 
 with passionate fervor; 
- Example: "both those for and against are fervently convinced they speak for the great majority of the people"- Example: "a fierily opinionated book"[syn: fierily, fervently, fervidly]
WordNet (r) 3.0 (2006):
fierily
    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]