idiocy (n.)

• amentia
• asininity
• backwardness
• buffoonery
• crankiness
• craziness
• cretinism
• eccentricity
• fatuity
• fatuousness
• folly
• foolery
• foolishness
• frivolity
• frivolousness
• giddiness
• imbecility
• inanity
• ineptitude
• infantilism
• insanity
• lunacy
• madness
• mindlessness
• mongolianism
• mongolism
• moronity
• queerness
• retardation
• senselessness
• silliness
• simpleness
• simplicity
• stupidity
• subnormality
• thoughtlessness
• triviality
• weirdness