Added 10 October 2026 unimpeachable adjective Categories: Describing WordsRare Words adjective ! Definition from Wiktionary (CC BY-SA). More about unimpeachable at Wordnik → Where our words come from → Not able to be impeached or reproached. a gentleman of unimpeachable integrity Blameless. Beyond doubt. an unimpeachable alibi Related Words: unexceptionableinculpableirreproachableblamelessclean-handedunquestionableinnocentguiltlessacceptableirrevocableundenounceableunreproachable Back to today's word