moron

Short definition from Wiktionary

Noun

1. 1
   A stupid person; an idiot; a fool.
2. 2
   A person of mild mental subnormality in the former classification of mental retardation, having an intelligence quotient of 50–70.
3. 3
   A hypothetical particle whose existence and configuration can make a moral judgment true.

Proper noun

1. 1
   A commune in southwestern Haiti.