Idiot

1. A common term for a person of low general intelligence (the term is considered offensive). In the past some towns had a village idiot.
2. A term for anyone who, on occasion, does a rather stupid or irrational thing or makes a silly or stupid comment. I was an idiot to believe her. I was an idiot to touch that electric wire before testing it. Only an idiot would put a animal like that in a car.