plainness
/ˈpleɪnnəs/
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the quality of being simple, without decoration or without anything added: There's something about the plainness of the design which I like.
noun [具体名词] 简单;朴素,平常;平坦;正直;平坦度
There was an elegant plainness in this small house. 这小屋子里有一种高雅的朴素。