The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Englishsymmetry
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishsymmetrical
- English todayunsymmetrical
From un- + symmetrical.
Etymology from Wiktionary, CC BY-SA 4.0.