Astonishingly

adv. [f. prec. + -LY².] In an astonishing manner; to an astonishing degree; amazingly, surprisingly.

1668.  Howe, Bless. Righteous, Wks. 1834, 227/2. Considerations that would render this astonishingly strange.

1803.  W. Taylor, in Ann. Rev., I. 744. Wherever bills of exchange originated, they are become astonishingly numerous.