idiocy

See also wisdom.

bovinity

the state or quality of being like a cow or ox, especially in the sense of being dull, stolid, and slow-witted. —bovine, adj.

cretinism

Medicine. a congenital deficiency of thyroid secretion causing deformity and idiocy. —cretinoid, cretinous, adj.

idiotism

1. the condition of an idiot, especially an extreme degree of mental deficiency, usually a mental age of less than three or four years; idiocy.

2. idiotic conduct or action, especially in a normal person. —idiotie, adj.

moronism

the condition of being slow or mentally deficiënt. —moronic, adj.

stultiloquence

Rare. foolish talk or babble.