DEFIANTLY
rebelliously, contumaciously, defiantly
(adverb) in a rebellious manner; “he rejected her words rebelliously”
Source: WordNet® 3.1
Etymology
Adverb
defiantly (comparative more defiantly, superlative most defiantly)
In a defiant manner.
Misspelling of definitely.
Source: Wiktionary
DEFIANT
De*fi"ant, a. Etym: [Cf. F. défiant, p. pr. of défier. See Defy.]
Definition: Full of defiance; bold; insolent; as, a defiant spirit or act.
In attitude stern and defiant. Longfellow.
– De*fi"ant*ly, adv.
– De*fi"ant*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition