noun. Mental retardation.

noun. Lack of development of intellectual capacity as a result of inadequate brain tissue.

noun. Imbecility of mind; idiocy or dotage. Formerly sometimes called amenty.

noun. Imbecility; total lack of understanding.

noun. Mental impairment; state of being mentally handicapped.

noun. extreme mental retardation

"= Cretinism = is a form of amentia, which is endemic in certain districts, especially in some of the valleys of Switzerland, Savoy, and France."

backwardness  mental retardation  retardation  slowness  subnormality  

arrested development  backwardness  blithering idiocy  cretinism  half-wittedness