IRREMISSIBLE Meaning of IRREMISSIBLE in English ■ adjective rare1》 (of a crime) unpardonable. 2》 (of an obligation or duty) binding.OriginME: from OFr., or from eccles. L. irremissibilis . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004