idle ·adjective (NOT SERIOUS)

小报上充斥着关于那位名人私生活的无聊八卦。

The tabloids were filled with ___idle gossip about the celebrity's personal life.

我们不能忽视这些警告；这绝非虚张声势的威胁。

We cannot ignore these warnings; this is no ___idle threat.

这起初只是一个环游世界的随意念头，但很快就变成了一个认真的计划。

It started as an ___idle thought about travelling the world, but soon turned into a serious plan.