misbehavior

The story

1. Proto-Indo-European*mey-?
2. Proto-Indo-European*meyth₂-
3. Proto-Germanic*missaz
4. Proto-Germanic*missa-
5. Proto-West Germanic*missa-
6. Old Englishmis-
7. Middle Englishmys-
8. Englishmis-
9. Proto-Indo-European*h₁ep-
10. Proto-Indo-European*h₁éps
11. Proto-Indo-European*h₁épi
12. Proto-Indo-European*h₁pi
13. Proto-Germanic*bi
14. Proto-Germanic*bi-
15. Proto-West Germanic*bi-
16. Proto-Indo-European*kap-
17. Proto-Germanic*habjaną
18. Proto-West Germanic*habbjan
19. Proto-West Germanic*bihabbjan
20. Old Englishbehabban
21. Middle Englishbehaven
22. Proto-Indo-European*gʰeh₁bʰ-
23. Proto-Indo-European*gʰh₁bʰéh₁yeti
24. Proto-Italic*haβēō
25. Latinhabeō
26. Old Frenchavoir
27. Middle Englishhavour
28. Middle Englishbehavoure
29. Englishbehavior
30. English todaymisbehavior

From mis- + behavior.