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Adjective: unadvised  ,ún-ud'vIzd
  1. Having received no information
    "a defendant unadvised of her legal rights"
  2. Without careful prior deliberation or counsel
    "took the unadvised measure of going public with the accusations";
    - ill-advised

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