imbecility (n.)
- amentia
- asininity
- backwardness
- buffoonery
- crankiness
- craziness
- cretinism
- disability
- disablement
- disqualification
- eccentricity
- fatuity
- fatuousness
- folly
- foolery
- foolishness
- frivolity
- frivolousness
- giddiness
- idiocy
- inability
- inadequacy
- inanity
- incapability
- incapacity
- incompetence
- incompetency
- inefficiency
- ineptitude
- infancy
- infantilism
- inferiority
- insanity
- insufficiency
- lunacy
- madness
- mindlessness
- minority
- mongolianism
- mongolism
- moronity
- queerness
- retardation
- senselessness
- silliness
- simpleness
- simplicity
- stupidity
- subnormality
- thoughtlessness
- triviality
- unfitness
- wardship
- weirdness
