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Adjective: thoroughgoing  ,thur-u'gow-ing or ,thur-ow'gow-ing [N. Amer], ,thú-ru'gow-ing [Brit]
  1. Performed comprehensively and completely; not superficial or partial
    "thoroughgoing research";
    - exhaustive, thorough, rigorous, in-depth
     
  2. Without qualification; used informally as an (often pejorative) intensifier
    "a thoroughgoing villain";
    - arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, stark, staring, thorough, utter, unadulterated, rigorous

See also: complete, unmitigated