adjective
EXAMPLES FROM CORPUS
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That would be seen by many as an unpardonable failure that disqualifies him from having a second run.
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To some it is even the ultimate treason against faith, the unpardonable sin.
UNPARDONABLE
Meaning of UNPARDONABLE in English
Longman DOCE5 Extras English vocabulary. Дополнительный английский словарь Longman DOCE5. 2012