adjective Date: 1784 not impeachable: as, reliable beyond a doubt , not liable to accusation ; irreproachable , unimpeachably adverb
UNIMPEACHABLE
Meaning of UNIMPEACHABLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012