eccentrically

The story

1. Proto-Indo-European*h₁éǵʰ
2. Proto-Indo-European*h₁eǵʰs
3. Proto-Hellenic*eks
4. Ancient Greekἐκ (ek)
5. Ancient Greekἐκ- (ek-)
6. Proto-Indo-European*ḱen-?
7. Proto-Indo-European*ḱéntrom
8. Proto-Hellenic*kéntron
9. Ancient Greekκέντρον (kéntron)
10. Ancient Greekἔκκεντρος (ékkentros)
11. Medieval Latineccentricus
12. Middle Frenchexcentrique
13. Englisheccentric
14. Proto-Indo-European*h₂el-
15. Proto-Indo-European*h₂élisder.?
16. Proto-Indo-European*leyg-
17. Proto-Germanic*līką
18. English todayeccentrically

From eccentric + -ally.