changeless

The story

1. Proto-Indo-European*kh₂em-?
2. Proto-Indo-European*(s)ḱh₂embos
3. Proto-Celtic*kambos
4. Gaulishcambion
5. Latincambium
6. Late Latincambiō
7. Late Latincambiāre
8. Old Frenchchangier
9. Anglo-Normanchaunger
10. Middle Englishchaungen
11. Englishchange
12. Proto-Indo-European*lewh₁-
13. Proto-Indo-European*lewHs-
14. Proto-Germanic*leusaną
15. Proto-Germanic*lausaz
16. English todaychangeless

From change + -less.