Meaning of “thorough” in the English Dictionary

"thorough" in British English

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uk /ˈθʌr.ə/ us /ˈθɝː.ə/ /ˈθɝː.oʊ/

thorough adjective (CAREFUL)

B2 detailed and careful:

a thorough revision of the manuscript
They did a thorough search of the area but found nothing.

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noun [ U ] uk /ˈθʌr.ə.nəs/ us /ˈθɝː.ə.nəs/ /ˈθɝː.oʊ.nəs/

You can rely on the thoroughness of his research.

(Definition of “thorough” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"thorough" in American English

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us /ˈθɜr·oʊ, ˈθʌr-/

thorough adjective (COMPLETE)

with nothing left out or omitted; complete:

The district attorney’s office conducted a thorough investigation.
The doctor gave him a thorough medical examination.

thorough adjective (VERY GREAT)

[ not gradable ] (used for emphasis) very great:

The meeting was a thorough waste of time.

(Definition of “thorough” from the Cambridge Academic Content Dictionary © Cambridge University Press)