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Adjective: derisible  di'ri-zu-bul [N. Amer], di'rI-si-bul or di'ri-zu-bul [Brit]
  1. So unreasonable as to invite derision
    "His derisible attempts at poetry";
    - absurd, cockeyed [informal], derisory, idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous, ridic [informal]

See also: crackpot [informal], crazy [informal], daft [Brit, informal], dumb, foolish, half-baked [informal], imbecile, imbecilic, moronic [informal], nutty [informal], screwball [informal], softheaded, stupid, wiggy [US, informal]