noun
1. retardation more severe than a moron but not as severe as an idiot
• Derivationally related forms: ↑imbecile
• Hypernyms: ↑retardation, ↑mental retardation, ↑backwardness, ↑slowness, ↑subnormality
2. a stupid mistake
• Syn: ↑stupidity, ↑betise, ↑folly, ↑foolishness
Useful english dictionary. 2012.