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unimpeachable (adj) blameless; spotless.
A person of unimpeachable conduct has such a good conduct that no complaint can be made about it, or no defect can be pointed out in it. Unimpeachable evidence is perfect proof, and cannot be questioned.
- His conduct as the president was unimpeachable. He conducted himself so well in his position that nobody can find fault with him. His record as president is spotless.
- There was unimpeachable evidence of his misconduct. There was very clear proof of his bad conduct, and no one could save him from punishment.