3 sentences

1. 我们要尽量避免无谓的浪费。

   wǒ​men yào jǐn​liàng bì​miǎn wú​wèi de làng​fèi.

   We should try our best to avoid senseless waste.

   Source: Dong Chinese Dictionary

2. 他并不想卷入这场无谓的争论。

   tā bìng bù xiǎng juǎn​rù zhè cháng wú​wèi de zhēng​lùn.

   He didn't want to get caught up in this pointless argument.

   Source: Dong Chinese Dictionary

3. 不要为这些无谓的小事烦恼。

   bù yào wèi zhè​xiē wú​wèi de xiǎo shì fán​nǎo.

   Don't worry about these pointless trifles.

   Source: Dong Chinese Dictionary