overactivity

The story

1. Proto-Indo-European*úp
2. Proto-Indo-European*upér
3. Proto-Germanic*uber
4. Old Englishofer-
5. Middle Englishover-
6. Englishover-
7. Proto-Indo-European*h₂eǵ-
8. Proto-Indo-European*h₂éǵeti
9. Proto-Italic*agō
10. Latinagō
11. Ancient Greekἐνεργητικός (energētikós)
12. Latināctīvus
13. Latināctīvitās
14. Middle Frenchactivité
15. Englishactivity
16. English todayoveractivity

From over- + activity.