The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Latinēmoveō
- Vulgar Latin*exmovēre
- Old Frenchesmovoir
- Middle Frenchesmouvoir
- Middle Frenchemotion
- Englishemotion
- Englishemotional
- Englishunemotional
- English todayunemotionally
From unemotional + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.