INCREDIBLY
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”
incredibly, improbably, implausibly, unbelievably
(adverb) not easy to believe; “incredibly, she survived the crash”
Source: WordNet® 3.1
Etymology
Adverb
incredibly (comparative more incredibly, superlative most incredibly)
(manner) In an incredible manner; not to be believed.
(degree) To a great extent; extremely.
Used to note the surprising or hard-to-believe nature of what is being said and suggest that it is nevertheless true.
Anagrams
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Source: Wiktionary
In*cred"i*bly, adv.
Definition: In an incredible manner.
INCREDIBLE
In*cred"i*ble, a. Etym: [L. incredibilis: cf. OF. incredible. See In-
not, and Credible.]
Definition: Not credible; surpassing belief; too extraordinary and
improbable to admit of belief; unlikely; marvelous; fabulous.
Why should it be thought a thing incredible with you, that God should
raise the dead Acts xxvi. 8.
Source: Webster’s Unabridged Dictionary 1913 Edition