smartingly

From smarting +‎ -ly.

smartingly (comparative more smartingly, superlative most smartingly)

1. So as to smart; with a stinging pain.
   • 1886 January 5, Robert Louis Stevenson, “Henry Jekyll’s Full Statement of the Case”, in Strange Case of Dr Jekyll and Mr Hyde, London: Longmans, Green, and Co., →OCLC, pages 124–125:

     The bargain might appear unequal; but there was still another consideration in the scales; for while Jekyll would suffer smartingly in the fires of abstinence, Hyde would be not even be conscious of all that he had lost.