Unbelievably definition
(manner) In a manner that one does not believe.
He gestured unbelievably. Everyone knew he was faking being sick.
adverb
(evaluative) Contrary to expectations, amazingly.
Unbelievably, Rudy saved the man's life but got sued for breaking two of his ribs.
adverb
(degree) To an extent not to be believed.
His face turned unbelievably blue. We realized he was actually choking.
adverb
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Origin of unbelievably
- unbelievable + -ly
From Wiktionary