FEROCIOUSLY
ferociously, fiercely
(adverb) in a physically fierce manner; “silence broken by dogs barking ferociously”; “they fought fiercely”
Source: WordNet® 3.1
Etymology
Adverb
ferociously (comparative more ferociously, superlative most ferociously)
In a ferocious manner, particularly violent and aggressive.
Intensely or extremely.
Source: Wiktionary
FEROCIOUS
Fe*ro"cious, a. Etym: [L. ferox, -ocis, fierce: cf. F. féroce. See
Ferocity.]
Definition: Fierce; savage; wild; indicating cruelty; ravenous; rapacious;
as, ferocious look or features; a ferocious lion.
The humbled power of a ferocious enemy. Lowth.
Syn.
– Ferocious, Fierce, Savage, Barbarous. When these words are
applied to human feelings or conduct, ferocious describes the
disposition; fierce, the haste and violence of an act; barbarous, the
coarseness and brutality by which it was marked; savage, the cruel
and unfeeling spirit which it showed. A man is ferocious in his
temper, fierce in his actions, barbarous in the manner of carrying
out his purposes, savage in the spirit and feelings expressed in his
words or deeds.
– Fe*ro"cious*ly, adv.
– Fe*ro"cious*ness, n.
It [Christianity] has adapted the ferociousness of war. Blair.
Source: Webster’s Unabridged Dictionary 1913 Edition