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*h₂el-
- Proto-Indo-European*h₂élyos
- Proto-Italic*aljos
- Proto-Italic*aliteros
- Latinalterī
- Vulgar Latin*alterui
- Old Frenchautrui
- Frenchautrui
- Frenchaltruisme
- Englishaltruism
- Englishaltruist
- Englishaltruistic
- Englishunaltruistic
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- English todayunaltruistically
From unaltruistic + -ally.
Etymology from Wiktionary, CC BY-SA 4.0.