2 sentences for 口舌 (kǒu​shé — words)

1. 别对他浪费口舌。

   bié duì tā làng​fèi kǒu​shé.

   Don't waste your breath on him.

   Source: OpenSubtitles

2. 别白费口舌去劝他了。

   bié bái fèi kǒu​shé qù quàn tā le.

   Don't waste your breath trying to persuade him.

   Source: AI Challenger 2017