FABULOUSLY
fabulously, fantastically, incredibly
(adverb) exceedingly; extremely; “she plays fabulously well”; “behind you the coastal hills plunge to the incredibly blue sea backed by the Turkish mountains”
Source: WordNet® 3.1
Etymology
Adverb
fabulously (comparative more fabulously, superlative most fabulously)
In a fabulous manner.
In fables.
Source: Wiktionary
FABULOUS
Fab"u*lous, a. Etym: [L. fabulosus; cf. F. fabuleux. See Fable.]
1. Feigned, as a story or fable; related in fable; devised; invented;
not real; fictitious; as, a fabulous description; a fabulous hero.
The fabulous birth of Minerva. Chesterfield.
2. Passing belief; exceedingly great; as, a fabulous price. Macaulay.
Fabulous age, that period in the history of a nation of which the
only accounts are myths and unverified legends; as, the fabulous age
of Greek and Rome.
– Fab"u*lous*ly, adv.
– Fab"u*lous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition