Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: thorough 'through' (11-21 centuries), from through

thorough

adjective
     
thor‧ough
1 including every possible detail [↪ thoroughly]:
The doctor gave him a thorough check-up.
a thorough and detailed biography
The police investigation was very thorough.
thorough notes of the meeting
2 [not usually before noun] careful to do things properly so that you avoid mistakes:
The screening of applicants must be thorough.
3

a thorough pest/nuisance/mess

British English used to emphasize the bad qualities of someone or something
thoroughness noun [uncountable]

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