nonadaptive

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*h₂éd
15. Proto-Italic*ad
16. Proto-Italic*ad-
17. Latinad-
18. Proto-Indo-European*h₂ep-
19. Proto-Indo-European*h₂ptós
20. Proto-Italic*aptos
21. Latinaptus
22. Proto-Indo-European[Term?]
23. Proto-Italic*apjō
24. Latinapiō
25. Latinaptō
26. Latinadaptō
27. Middle English*adapten
28. Englishadapt
29. Englishadaptive
30. English todaynonadaptive

From non- + adaptive.