formidably

From formidable +‎ -ly.

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formidably (comparative more formidably, superlative most formidably)

1. In a formidable manner.
   • 1849, Currer Bell [pseudonym; Charlotte Brontë], “Mr. Donne’s Exodus”, in Shirley. A Tale. […], volume II, London: Smith, Elder and Co., […], →OCLC, page 99:

     The black-muzzled, tawny dog, a glimpse of which was seen in the chapter which first introduced its mistress to the reader, here gave tongue in the hall, amidst whose hollow space the deep bark resounded formidably.

   • 1933, Barnaby Ross, Drury Lane's Last Case, March 1946 republication as by Ellery Queen, Little, Brown, page 45:

     But the Inspector was made of stern stuff. He closed his right hand and with the resulting fist pounded formidably on the bronze.