IDIOTISM

idiotism. Idiotism, n. peculiarity of expression, idiocy

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Id″i‐ot‐ism (?), n. [[F. idiotisme, L. idiotismus the way of fashion of a private person, the common or vulgar manner of speaking, Gr. �, fr. � to put into or use common language, fr. �. See Idiot.]] 1. 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. 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.