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Adjective: derisory  di'rI-su-ree
  1. So unreasonable as to invite derision
    "the derisory excuse that the dog ate his homework";
    - absurd, cockeyed [informal], idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous, ridic [informal]

See also: daft [Brit, informal], dumb, foolish, imbecile, imbecilic, stupid