uneccentric

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. Proto-Indo-European*h₁éǵʰ
9. Proto-Indo-European*h₁eǵʰs
10. Proto-Hellenic*eks
11. Ancient Greekἐκ (ek)
12. Ancient Greekἐκ- (ek-)
13. Proto-Indo-European*ḱen-?
14. Proto-Indo-European*ḱéntrom
15. Proto-Hellenic*kéntron
16. Ancient Greekκέντρον (kéntron)
17. Ancient Greekἔκκεντρος (ékkentros)
18. Medieval Latineccentricus
19. Middle Frenchexcentrique
20. Englisheccentric
21. English todayuneccentric

From un- + eccentric.