nonalchemical

The story

1. Proto-Indo-European*né
2. Proto-Germanic*ne
3. Proto-Indo-European*ís?
4. Proto-Indo-European*h₁óynos
5. Proto-Germanic*ainaz
6. Proto-Germanic*nainaz
7. Proto-West Germanic*nain
8. Old Englishnān
9. Middle Englishnon
10. Old Englishnān
11. Old Englishnān-
12. Middle Englishnon-
13. Englishnon-
14. Proto-Indo-European*ǵʰew-
15. Ancient Greekχῠ́μᾰ (khŭ́mă)
16. Ancient Greekχυμείᾱ (khumeíā)
17. Arabicالْكِيمِيَاء (al-kīmiyāʔ)
18. Medieval Latinalchēmīa
19. Old Frenchalkimie
20. Englishalchemy
21. Proto-Indo-European*h₂el-
22. Proto-Indo-European*h₂élisder.?
23. Englishalchemical
24. English todaynonalchemical

From non- + alchemical.