- 1done completely; with great attention to detail a thorough knowledge of the subject The police carried out a thorough investigation.
- 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.
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noun [uncountable] I was impressed by the thoroughness of the report. I admire his thoroughness.