undisambiguated

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*dwóh₁
9. Proto-Indo-European*trísinflu.
10. Proto-Indo-European*d(w)is-
11. Proto-Italic*dis-
12. Latindis-
13. Old Frenchdes-
14. Latindis-
15. Middle Englishdis-
16. Englishdis-
17. Proto-Indo-European*h₂ent-
18. Proto-Indo-European*h₂énts?
19. Proto-Indo-European*h₂m̥bʰí
20. Proto-Italic*amβi-
21. Latinambi-
22. Proto-Indo-European*h₂eǵ-
23. Proto-Indo-European*h₂éǵeti
24. Proto-Italic*agō
25. Latinagō
26. Latinambig(ō)
27. Latinambiguu
28. Englishambigu(ous)
29. Englishambiguate
30. Englishdisambiguated
31. English todayundisambiguated

From un- + disambiguated.