undropsical

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*wed-
9. Proto-Indo-European*wódr̥
10. Proto-Hellenic*údōr
11. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
12. Ancient Greekῠ̔́δρωψ (hŭ́drōps)
13. Latinhydrōps
14. Late Latinhydropisia
15. Old Frenchydropisie
16. Middle Englishidropesie
17. Englishdropsy
18. Proto-Indo-European*h₂el-
19. Proto-Indo-European*h₂élisder.?
20. Englishdropsical
21. English todayundropsical

From un- + dropsical.