Confoundingly

adv. [f. prec. + -LY².] In a confounding manner; perplexingly, amazingly.

1667.  H. More, Div. Dial., III. xix. (1713), 220. No Phænomenon … has more confoundingly astonished and amazed me.

1675.  Howe, Living Temple, Wks. (1834), 36. A reason of mighty force, and confoundingly demonstrative.

1865.  Dickens, Mut. Fr., II. i. Confoundingly perplexing jumble.