If you say that something spoken or written is nonsense, you mean that you consider it to be untrue or silly.

You can use nonsense to refer to something that you think is foolish or that you disapprove of.

You can refer to spoken or written words that do not mean anything because they do not make sense as nonsense .

To make a nonsense of something or to make nonsense of it means to make it seem ridiculous or pointless.