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say it: uhn-im-PEE-chuh-buhl
unimpeachable is an adjective meaning "beyond doubt or reproach". It carries 3 recorded senses.
free of guilt; not subject to blame
“has lived a blameless life”
“of irreproachable character”
“an unimpeachable reputation”
completely acceptable; not open to exception or reproach
“two unexceptionable witnesses”
“a judge's ethics should be unexceptionable”
Definitions, synonyms and semantic relations for unimpeachable come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.