Bewilderingly

adv. [f. prec. + -LY².] In a bewildering manner; so as to bewilder.

1826.  Natchez Gaz., 28 Oct., 1/2. The rain fell heavy, and dark, and bewilderingly.

1838.  New Monthly Mag., LIII. 524. Our bark is bewild’ringly blown back, forward, or sideways.

1865.  Athenæum, No. 1974. 285/1. Bewilderingly multitudinous.