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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Extreme folly or stupidity.
  2. n. A foolish or stupid utterance or deed.
  3. n. Psychology The state or condition of being an idiot; profound mental retardation.

Century Dictionary and Cyclopedia

  1. n. The state of being an idiot; natural absence or marked defect of understanding; mental imbecility. See idiot.

Wiktionary

  1. n. The state or condition of being an idiot; the quality of having an intelligence level far below average; mental retardation.
  2. n. An act lacking intelligence or sense; an instance of senselessness; extremely foolish behaviour.

GNU Webster's 1913

  1. n. The condition or quality of being an idiot; absence, or marked deficiency, of sense and intelligence.

WordNet 3.0

  1. n. extreme mental retardation

Etymologies

  1. From idiot.

Examples

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‘idiocy’ has been looked up 1085 times, added to 10 lists, and has a Scrabble score of 12.