nonaccumulative

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*ḱewh₁-
19. Proto-Indo-European*ḱuh₁mósder.?
20. Latincumulus
21. Latincumulō
22. Latinaccumulō
23. Latinaccumulātus
24. Middle Englishaccumylaten
25. Englishaccumulate
26. Englishaccumulative
27. English todaynonaccumulative

From non- + accumulative.