
1) Idiocy 2) Idiotic conduct or action
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https://www.crosswordclues.com/clue/idiotism

1) Phrase
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https://www.crosswordclues.com/clue/idiotism

• (n.) An idiom; a form, mode of expression, or signification, peculiar to a language. • (n.) Lack of knowledge or mental capacity; idiocy; foolishness.
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http://thinkexist.com/dictionary/meaning/idiotism/
Id'i·ot·ism noun [ French
idiotisme , Latin
idiotismus the way of fashion of a private person, the common or vulgar manner of speaking, Greek ..., from ... to put into or use common language, from .... See
Idiot .]
1. An idiom; a form, mode of expression, or signification,...
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http://www.encyclo.co.uk/webster/I/5

idiotism The state of being an idiot. Some psychiatrists have divided insanity into four subdivisions; namely, mania, melancholia, dementia, and idiotism (advanced dementia).
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http://www.wordinfo.info/words/index/info/view_unit/2794/5

idiotic conduct or action. · idiocy.
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https://www.infoplease.com/dictionary/idiotism
No exact match found.