1. to do something carefully and completely, paying attention to all details
You need to be thorough when reviewing the contract before signing it.
Você precisa ser minucioso ao revisar o contrato antes de assiná-lo.
2. to examine or investigate something in a complete and detailed manner
The inspector will be thorough in checking all safety measures.
O inspetor será minucioso na verificação de todas as medidas de segurança.