The story
- Proto-West Germanic · inherited from*missadādig
- Old English · inherited from*misdǣdiġ
- Middle English · inherited frommisdedi
- English todaymisdeedy
From Middle English misdedi, from Old English *misdǣdiġ, from Proto-West Germanic *missadādig, equivalent to misdeed + -y. Cognate with West Frisian misdiedich, Dutch misdadig, German missetätig.
Etymology from Wiktionary, CC BY-SA 4.0.