The story
- Middle English · inherited fromon-wytyngly
- English todayunwittingly
From Middle English on-wytyngly, un-wetandly, unweteynglye, unwetinglie, un-wetinglye, unwetyngly, unwitandly, unwitendely, unwitingly, unwittandly, unwityngli, unwityngly, unwytyngeleche, unwytyngli, equivalent to unwitting + -ly or un- + wittingly.
Etymology from Wiktionary, CC BY-SA 4.0.