esthetical

The story

1. Proto-Indo-European*h₂ew-
2. Proto-Indo-European*dʰeh₁-
3. Proto-Indo-European*h₂ewis-dʰh₁
4. Proto-Hellenic*awistʰomai
5. Ancient Greekαἰσθάνομαι (aisthánomai)
6. Ancient Greekαἴσθησῐς (aísthēsĭs)
7. Ancient Greekαἰσθητικός (aisthētikós)
8. Latinaesthēticus
9. GermanÄsthetik
10. New Latinaesthēticu
11. Frenchesthétique
12. Englishaesthetic
13. Englishesthetic
14. Proto-Indo-European*h₂el-
15. Proto-Indo-European*h₂élisder.?
16. English todayesthetical

From esthetic + -al.