The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Proto-Indo-European*(s)kelH-
- Proto-Germanic*skilją
- Old Norseski
- Middle Englishskill
- Englishskill
- Englishskilled
- English todayunskilled
Etymology from Wiktionary, CC BY-SA 4.0.