happenstantial

The story

1. Proto-Indo-European*kob-
2. Proto-Germanic*hampą
3. Proto-Germanic*hampijaną
4. Old Norse*happader.?
5. Proto-Germanic*hampijaną
6. Old Norse*heppader.?
7. Old Englishhæppander.?
8. Middle Englishhappen
9. Middle Englishhappenen
10. Englishhappen
11. Englishhappening
12. Proto-Indo-European*(s)ker-
13. Ancient Greekκίρκος (kírkos)
14. Latincircus
15. Latincircum
16. Latincircum-
17. Proto-Indo-European*steh₂-
18. Proto-Indo-European*sth₂éh₁yeti
19. Proto-Italic*staējō
20. Proto-Italic*staēō
21. Latinstō
22. Latincircumstō
23. Latincircumstāns
24. Latincircumstāntia
25. Old Frenchcirconstance
26. Middle Englishcircumstaunce
27. Englishcircumstance
28. Englishhappenstance
29. Latincircumstantia
30. Proto-Indo-European*h₂el-
31. Proto-Indo-European*h₂élisder.?
32. Englishcircumstantial
33. English todayhappenstantial

Blend of happenstance + circumstantial. Equivalent to happenstance + -ial.