A platitude is a statement which is considered meaningless and boring because it has been made many times before in similar situations.
例句
Why couldn't he say something original instead of spouting the same old platitudes?他为什么就不能讲些有新意的话,而不是喋喋不休地说些老生常谈呢?...a stream of platitudes, outlining many problems but offering few solutions.概述了很多问题、但几乎没有提出解决办法的一串陈词滥调