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*mer-
- Proto-Indo-European*mértis ~ *mr̥téys
- Proto-Italic*mortis
- Latinmors
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Latinmortālis
- Old Frenchmortal /mortel
- Middle Englishmortal /mortel
- Englishmortal
- English todayunmortal
Etymology from Wiktionary, CC BY-SA 4.0.