1. Insanely irresponsible (synset 302082867)
    "an idiotic idea"
  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"
  3. Having a mental age of three to seven years (synset 301846795)

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