discoherent

The story

1. Proto-Indo-European*dwóh₁
2. Proto-Indo-European*trísinflu.
3. Proto-Indo-European*d(w)is-
4. Proto-Italic*dis-
5. Latindis-
6. Old Frenchdes-
7. Latindis-
8. Middle Englishdis-
9. Englishdis-
10. Proto-Indo-European*ḱe?
11. Proto-Indo-European*ḱóm
12. Proto-Italic*kom
13. Proto-Italic*kom-
14. Latincon-
15. Latinhaereō
16. Latincohaereō
17. Latincohaerēns
18. Middle Frenchcoherent
19. Englishcoherent
20. English todaydiscoherent

From dis- + coherent.