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*sent-
- Proto-Italic*sentiō
- Latinsentiō
- Latinsentimentum
- Old Frenchsentement
- Englishsentiment
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishsentimental
- English todayunsentimental
From un- + sentimental.
Etymology from Wiktionary, CC BY-SA 4.0.