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Adjective: thorough  thur-ow [N. Amer], thú-ru [Brit]
  1. Painstakingly careful and accurate
    "thorough research"; "our accountant is thorough";
    - rigorous
     
  2. Performed comprehensively and completely
    "made a thorough search";
    - exhaustive, thoroughgoing, in-depth, rigorous

See also: careful, complete

Encyclopedia: Thorough