decorous [ˈdekərəs]

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adj.合宜的；符合礼节的；相称的

behaving politely and in a controlled way

They go for decorous walks every day in parks with their nanny.他们每天都和保姆一起在公园里散步，表现得很有教养。
He gave his wife a decorous kiss.他给了他太太得体的一吻。