名词一本正经; 认真，沉着
1. 认真：staid 认真的 | staidness 认真 | stain 污点
2. 踏实：刻苦 assiduity | 踏实 staidness | 谨慎 carefulness
noun
1. a trait of dignified seriousness
Synonym: sedateness solemnity solemness