flowkirkuinely

The story

1. Proto-Indo-European*plew-
2. Proto-Indo-European*plōw-der.?
3. Proto-Indo-European*pleh₃(w)-der.?
4. Proto-Germanic*flōaną
5. Proto-West Germanic*flōan
6. Old Englishflōwan
7. Middle Englishflowen
8. Middle Englishflowe
9. Englishflow
10. Proto-Indo-European*legʰ-
11. Proto-Indo-European*légʰyeti
12. Proto-Germanic*ligjaną
13. Proto-Germanic*lēgaz
14. Old Norselágr
15. Middle Englishlāh
16. Englishlow
17. Proto-West Germanic*kaiju
18. Old Englishcǣġ
19. Middle Englishkeye
20. Englishkey
21. Englishlowkey
22. Proto-Indo-European*ǵenh₁-
23. Proto-Indo-European*ǵénh₁os
24. Proto-Italic*genos
25. Latingenus
26. Latingenuīnus
27. Englishgenuine
28. Proto-Indo-European*leyg-
29. Proto-Germanic*līką
30. Englishgenuinely
31. Englishlowkenuinely
32. Proto-Indo-European*ḱewh₁-
33. Proto-Indo-European*ḱuh₁ryós
34. Proto-Hellenic*kúrios
35. Ancient Greekκῡ́ριος (kū́rios)
36. Koine Greekκῡριακός (kūriakós)
37. Koine Greekκῡρῐᾰκόν (kūrĭăkón)
38. Proto-West Germanic*kirikā
39. Old Englishċiriċe
40. Old Norsekirkja
41. Northern Middle Englishkirke
42. Englishkirk
43. EnglishKirk
44. Englishlowkirkuinely
45. English todayflowkirkuinely

Blend of flow + lowkirkuinely. Like the inclusion of Kirk in lowkirkuinely, the inclusion of flow in flowkirkuinely is a humorous sound association that has no bearing on the word's meaning.