If you refer to something as a triviality, you think that it is unimportant and not serious.
例句
He accused me of making a great fuss about trivialities...他指责我为丁点琐事大惊小怪。Interviews with politicians were juxtaposed with news items of quite astonishing triviality.对政治家的访谈与内容相当耸动的八卦新闻放在同一个版面。