idiotism

Id´i`ot`ism

n.	1.	An idiom; a form, mode of expression, or signification, peculiar to a language. Scholars sometimes give terminations and idiotisms, suitable to their native language, unto words newly invented. - M. Hale.
	2.	Lack of knowledge or mental capacity; idiocy; foolishness. Worse than mere ignorance or idiotism. - Shaftesbury. The running that adventure is the greatist idiotism. - Hammond.

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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.

See also: Idiocy