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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; not superficial or partial
    "made a thorough search";
    - exhaustive, thoroughgoing, rigorous, in-depth
  3. Without qualification; used informally as an (often pejorative) intensifier
    "a thorough nuisance";
    - arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, stark, staring, thoroughgoing, utter, unadulterated, rigorous

See also: careful, complete, unmitigated

Encyclopedia: Thorough