Definition of "idiot" in English

noun

1. (derogatory) A person of low general intelligence.

   • Only an idiot would fail this exam.
   • After failing a hat-trick of exams, the teacher called him an idiot.

2. (derogatory) A person who makes stupid decisions; a fool.

   • He thought people who don't like cricket are idiots. He later got into fights with people who like football.
   • We think that people who cycle without a helmet are idiots.

3. (obsolete, medicine, psychology) A person of the lowest intellectual standing, a person who lacks the capacity to develop beyond the mental age of a normal four-year-old; a person with an IQ below 30.

adjective

1. (uncommon) Idiotic, stupid.