unagglutinated

The story

1. Proto-Indo-European*né
2. Proto-Indo-European*n̥-
3. Proto-Germanic*un-
4. Proto-West Germanic*un-
5. Old Englishun-
6. Middle Englishun-
7. Englishun-
8. Proto-Indo-European*h₂éd
9. Proto-Italic*ad
10. Proto-Italic*ad-
11. Latinad-
12. Proto-Indo-European*gleyH-
13. Proto-Indo-European*glóh₁ytn̥
14. Proto-Italic*gloiten
15. Latinglūten
16. Latinglūtinō
17. Latinagglūtinō
18. Latinagglūtinātu
19. Englishagglutinated
20. English todayunagglutinated

From un- + agglutinated.