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Use "unpardonably" in a sentence
"I have unpardonably neglected to make the enquiry at the Fortune"
"So pervasive is the leftist atmosphere that ambitious people in other industries and in many urban settings have learned that to even express curiosity about conservatism instead of accepting the crudest of caricatures of the political opposition might stigmatize them as unpardonably stupid and unfit for their high status jobs."
"I had thought Ms. Greer was being unpardonably arrogant."