Pronunciation (UK) IPA (key): /ˈθʌ.rə/ or /ˈθʌrəʊ/ (US) IPA (key): /ˈθʌ.roʊ/ Audio (UK)(file) Audio (US)(file) Audio (US)(file) Adjective Positive thorough Comparative more thorough Superlative most thorough Careful not to miss or omit any detail. The thorough investigation by the police led to the arrest of the criminals. These are the most thorough workers I have ever seen. complete; absolute It is a thorough pleasure to see the building finished.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads