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Entry 1 sense Webster, 1913

Unimpeachable

/ŭnˌ-ĭm-pēch'-əb-əl/ · Un·im·peach·a·ble · IPA /ˌʌnɪmpˈiːtʃəbəl/
01 a. Not impeachable; not to be called in question; exempt from liability to accusation; free from stain, guilt, or fault; irreproachable; blame…
  1. 1.
    Not impeachable; not to be called in question; exempt from liability to accusation; free from stain, guilt, or fault; irreproachable; blameless; as, an unimpeachable reputation; unimpeachable testimony.