The story
- Classical Latin · derived fromimbēcillitās
- Middle French · derived fromimbecilité, imbecillité
- Middle English · inherited frominbecillite
- English todayimbecility
From Middle English inbecillite, from Middle French imbecilité, imbecillité, and its etymon Classical Latin imbēcillitās. By surface analysis, imbecile + -ity.
Etymology from Wiktionary, CC BY-SA 4.0.