Definition of thorough adjective from the Oxford Advanced American Dictionary

      

    thorough

     adjective
    adjective
    NAmE//ˈθəroʊ//
     
     
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  1. 1done completely; with great attention to detail a thorough knowledge of the subject The police carried out a thorough investigation.
  2. 2[not usually before noun] (of a person) doing things very carefully and with great attention to detail She's very thorough and conscientious. He was determined to be thorough in his research.
thoroughness
 
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noun [uncountable] I was impressed by the thoroughness of the report. I admire his thoroughness.
See the Oxford Advanced Learner's Dictionary entry: thorough