/ˌənɪmˈpiːtʃəbəl ˈwɪtnəs/ – Phrase
Definition: nhân chứng hoàn hảo, nhân chứng không thể chê trách.
A more thorough explanation: An “unimpeachable witness” refers to a witness whose testimony is considered to be beyond doubt or reproach, and whose credibility and reliability are unquestionable. This term is often used in legal contexts to describe a witness whose testimony is highly trustworthy and cannot be easily discredited or challenged.
Example: The prosecution presented an unimpeachable witness who provided crucial testimony in the case.