flyinglyadv.
Etymology: Previous versions of the OED give the stress as: ˈflyingly.
rare.
the world > action or operation > prosperity > success > [adverb] > very
1741 S. Richardson IV. xlviii. 296 Studying what to say, that she may come off as flyingly as she can.
This entry has not yet been fully updated (first published 1897; most recently modified version published online June 2019).