<p><strong>Noun</strong></p><ul><li>Informal: an utterly foolish or senseless person: If you think you can wear that outfit to a job interview and get hired, you're an idiot!</li><li>Synonyms: numbskull, dunce, dolt, imbecile, half-wit, fool.</li><li>Psychology: (no longer in technical use; considered offensive) a person of the lowest order in a former and discarded classification of intellectual disability, having a mental age of less than three years old and an intelligence quotient under 25.</li></ul>