unacademical

The story

1. Proto-Indo-European*né
2. Proto-Indo-European*n̥-
3. Proto-Germanic*un-
4. Proto-West Germanic*un-
5. Old Englishun-
6. Middle Englishun-
7. Englishun-
8. Ancient GreekἈκάδημος (Akádēmos)
9. Ancient GreekἈκαδημία (Akadēmía)
10. Ancient GreekἈκάδημος (Akádēmos)
11. Ancient GreekἈκαδήμεια (Akadḗmeia)
12. Ancient Greekἀκαδημικός (akadēmikós)
13. Latinacadēmicus
14. Proto-Indo-European*h₂el-
15. Proto-Indo-European*h₂élisder.?
16. Englishacademical
17. English todayunacademical

From un- + academical.