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Adjective: unwise (unwiser,unwisest)  ,ún'wIz
  1. Showing or resulting from lack of judgment or wisdom
    "an unwise investor is soon impoverished"
     
  2. Not appropriate to the purpose
    "His unwise decision led to financial troubles";
    - inexpedient

Derived forms: unwiser, unwisest

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

Encyclopedia: Unwise