The story
- Old English · inherited fromwillendlīċe“diligently”
- Middle English · inherited fromwillyngly
- English todaywillingly
From Middle English willyngly, wyllyngly (“intentionally, deliverately; freely, gladly”), from Old English willendlīċe (“diligently”), equivalent to willing + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.