id·i·o·cy

[id-ee-uh-see]
noun, plural id·i·o·cies.
1.
utterly senseless or foolish behavior; a stupid or foolish act, statement, etc.
2.
Psychology. (no longer in technical use; considered offensive) the state of being an idiot.

Origin:
1520–30; idio(t) + -cy; compare Greek idiōteía uncouthness


1. foolishness, inanity, folly.
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World English Dictionary
idiocy (ˈɪdɪəsɪ) [Click for IPA pronunciation guide]
 
n , pl -cies
1.  (not in technical usage) severe mental retardation
2.  foolishness or senselessness; stupidity
3.  a foolish act or remark

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Idiocy is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
American Heritage
Medical Dictionary

idiocy id·i·o·cy (ĭd'ē-ə-sē)
n.
The state or condition of being an idiot; profound mental retardation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
To suggest that is how a speech should be delivered is cretinous idiocy.
But others view a doctor's willingness to film his work as a sign of idiocy.
Why you do not understand this is a testament your idiocy.
Guest, in particular, does a wonderful job of capturing his character's sincere
  idiocy.
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