他花了一整天看些无聊的短视频，真是浪费时间。

He spent the whole day watching ___frivolous short videos, what a waste of time.

她总是带着嬉笑的态度，从不为任何事情烦恼。

She always has a ___frivolous attitude and never worries about anything.

律师认为对方的索赔毫无法律依据，完全是无理取闹。

The attorney argued that the opposing party's claim was completely ___frivolous and without legal merit.