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idiotic

[id-ee-ot-ik]
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adjective
  1. of, relating to, or characteristic of an idiot.
  2. senselessly foolish or stupid: an idiotic remark.
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Also id·i·ot·i·cal.

Origin of idiotic

1705–15; < Late Latin idiōticus < Greek idiōtikós private, ignorant. See idiot, -ic
Related formsid·i·ot·i·cal·ly, adverbid·i·ot·i·cal·ness, noun

Synonyms

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half-witted, imbecilic, fatuous, inane, asinine.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for idiotical

idiotic

adjective
  1. of or resembling an idiot; foolish; senseless
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Derived Formsidiotically, adverbidioticalness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for idiotical

idiotic

adj.

1713, from Late Latin idioticus "uneducated, ignorant," in classical Latin, "of an ordinary person," from Greek idiotikos "unprofessional, unskilled; not done by rules of art, unprofessional," from idiotes (see idiot). Idiotical is from 1640s. Related: Idiotically.

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Online Etymology Dictionary, © 2010 Douglas Harper