misactivate

The story

1. Proto-Indo-European*mey-?
2. Proto-Indo-European*meyth₂-
3. Proto-Germanic*missaz
4. Proto-Germanic*missa-
5. Proto-West Germanic*missa-
6. Old Englishmis-
7. Middle Englishmys-
8. Englishmis-
9. Proto-Indo-European*h₂eǵ-
10. Proto-Indo-European*h₂éǵeti
11. Proto-Italic*agō
12. Latinagō
13. Ancient Greekἐνεργητικός (energētikós)
14. Latināctīvu
15. Old Frenchactif
16. Middle Englishactyf
17. Englishactive
18. Englishactivate
19. English todaymisactivate

From mis- + activate.