unarchitectural

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*h₂er-der.?
9. Proto-Indo-European*h₂ergʰ-der.?
10. Ancient Greekἄρχω (árkhō)
11. Ancient Greekἀρχι- (arkhi-)
12. Proto-Indo-European*teḱ-
13. Proto-Indo-European*tetḱ-
14. Proto-Indo-European*tétḱō
15. Proto-Hellenic*téktōn
16. Ancient Greekτέκτων (téktōn)
17. Ancient Greekἀρχιτέκτων (arkhitéktōn)
18. Latinarchitectus
19. Latinarchitectūra
20. Frencharchitecture
21. Englisharchitecture
22. Proto-Indo-European*h₂el-
23. Proto-Indo-European*h₂élisder.?
24. Englisharchitectural
25. English todayunarchitectural

From un- + architectural.