thorough
adjective
ˈθʌrə 
ˈθɜːroʊ 
1 done completely; with great attention to detaila thorough knowledge of the subjectThe police carried out a thorough investigation.2 [not usually before noun] (of a person) doing things very carefully and with great attention to detailShe's very thorough and conscientious.He was determined to be thorough in his research.3 (British English, informal) used to emphasize how bad or annoying somebody/something isSynonym
completeEverything was in a thorough mess.thoroughness ˈθʌrənəs ˈθɜːroʊnəs 