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