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Not able to be mailed; specifically (US) not admissible to mail services for dispatch or delivery.
Mid 19th century; earliest use found in New York Herald. From un- + mailable.
礼仪网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。