idiocy

[id-ee-uh-see]
noun, plural idiocies.
1.
utterly senseless or foolish behavior; a stupid or foolish act, statement, etc.: All this talk of zombies coming to attack us is pure idiocy.
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)
 
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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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
Part of being a professor is fighting against the idiocy that surrounds us
  every day.
In fact, both ideologies are flawed to the point of single-minded idiocy.
Why you do not understand this is a testament your idiocy.
There may be a touch of validity to the frustrating helplessness of the couple
  faced by all of this murderous idiocy.
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