unimpeachable
/ˌʌn.ɪmˈpiː.tʃə.bəl/
adjective
- Not able to be doubted, questioned, or criticized; completely trustworthy and reliable.
- The witness provided unimpeachable evidence that solved the case.
- Her unimpeachable character made her the ideal candidate for the position.
- The historian's research is based on unimpeachable sources.
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