idiotic

Adjective
  1. Insanely irresponsible (synset 302082867)
    "an idiotic idea"
    similar to: insane - afflicted with or characteristic of mental derangement
    same as: crackbrained
  2. So unreasonable as to invite derision (synset 302581199)
    "the absurd excuse that the dog ate his homework"; "that's a cockeyed idea"; "ask a nonsensical question and get a nonsensical answer"; "a contribution so small as to be laughable"; "it is ludicrous to call a cottage a mansion"; "a preposterous attempt to turn back the pages of history"; "her conceited assumption of universal interest in her rather dull children was ridiculous"
    similar to: foolish - devoid of good sense or judgment
    same as: absurd, cockeyed, derisory, laughable, ludicrous, nonsensical, preposterous, ridiculous
  3. Having a mental age of three to seven years (synset 301846795)
    similar to: retarded - relatively slow in mental or emotional or physical development
    same as: imbecile, imbecilic

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