difficultly

From difficult +‎ -ly.

difficultly (comparative more difficultly, superlative most difficultly)

1. (archaic) With difficulty; not easily.
   • 1749, Henry Fielding, The History of Tom Jones, a Foundling:

     In fact, we regard these efforts as insults on our understanding, and to such the pride of man is very difficultly brought to submit.