1. (noun) a stupid mistake

• betise
• folly
• foolishness
• stupidity

1. (noun) retardation more severe than a moron but not as severe as an idiot

• backwardness
• mental retardation
• retardation
• slowness
• subnormality

2. (noun) a stupid mistake

• error
• fault
• mistake

1. (noun) retardation more severe than a moron but not as severe as an idiot

• idiotic
• imbecile
• imbecilic