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Adjective: inadvisable  ,in-ud'vI-zu-bul
  1. Not advisable
    "an unnecessary and inadvisable action"
  2. Not prudent or wise; not recommended
    "running on the ice is inadvisable";
    - unadvisable

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