'Incredibly' definitions:

Definition of 'incredibly'

From: WordNet
adverb
Not easy to believe; "behind you the coastal hills plunge to the incredibly blue sea backed by the Turkish mountains" [syn: incredibly, improbably, implausibly, unbelievably] [ant: believably, credibly, plausibly, probably]
adverb
Exceedingly; extremely; "she plays fabulously well" [syn: fabulously, fantastically, incredibly]

Definition of 'Incredibly'

From: GCIDE
  • Incredibly \In*cred"i*bly\, adv. In an incredible manner. [1913 Webster]