Synonyms:
incredibly, improbably, implausibly, unbelievably
Meaning: not easy to believe; "behind you the coastal hills plunge to the incredibly blue sea backed by the Turkish mountains"
Usage examples
He put his finger to his lip and looked incredibly sly.
He never had a chance to make a stroke, but his partner took care to make him run an incredibly large odd number as a wind up to every over.
She had hit on old "Nelse" Ackerman, the banker. Ackerman was enormously and incredibly wealthy; he was called the financial king of American City.