a. i. e. rough and genuine like unminted goldor silver,unalloyed,not put into general circulation.not in common use （像尚未铸成硬币的金银那样）粗糙而纯真的，不搀杂质的，未投入广泛流通的，未经公共使用的。 △H.V.5.2.159 (152):“And while thou livest. dear Kate.take a fellow of plain and uncoined constancy:”(Sheis to avoid men who circulate from one lady to another. like money.)在你的有生之年，亲爱的凯蒂，请你接受一个朴实无华但是情感坚定、毫不掺假的人吧。