这个电影太单调了，我睡着了。

Zhège diànyǐng tài dāndiàole, wǒ shuìzháo le.

This movie is too monotonous; I fell asleep.

她的声音听起来很单调。

Tā de shēngyīn tīng qǐlai hěn dāndiào.

Her voice sounds very monotone.

工作中加入一些创新可以避免单调。

Gōngzuò zhōng jiārù yīxiē chuàngxīn kěyǐ bìmiǎn dāndiào.

Adding some innovation to work can avoid monotony.