nonprognostic

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*per-der.?
15. Proto-Indo-European*pér
16. Proto-Indo-European*pró
17. Ancient Greekπρό (pró)
18. Ancient Greekπρο- (pro-)
19. Proto-Indo-European*ǵneh₃-
20. Proto-Indo-European*ǵneh₃tis
21. Ancient Greekγνῶσις (gnôsis)
22. Ancient Greekγνωστῐκός (gnōstĭkós)
23. Ancient Greekπρο- (pro-)
24. Ancient Greekγνῶσῐς (gnôsĭs)
25. Ancient Greekπρόγνωσῐς (prógnōsĭs)
26. Ancient Greekπρογνωστῐκός (prognōstĭkós)
27. Medieval Latinprognosticus
28. Englishprognostic
29. English todaynonprognostic

From non- + prognostic.