nonshameful

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-Germanic*skamō
15. Proto-West Germanic*skamu
16. Old Englishsċamu
17. Proto-Indo-European*pleh₁-
18. Proto-Indo-European*pl̥h₁nós
19. Proto-Germanic*fullaz
20. Old Englishsċeomfull
21. Middle Englishschameful
22. Englishshameful
23. English todaynonshameful

From non- + shameful.