debility

The story

1. Latin · derived fromdēbilitās“weakness”
2. Old French · derived fromdebilité
3. Middle English · inherited fromdebylite
4. English todaydebility

From Middle English debylite, from Old French debilité (French débilité), from Latin dēbilitās (“weakness”), from dēbilis (“weak”), from dē- + habilis (“able”).