[wú shù]
（难以计算） innumerable; countless; infinity; myriad; uncounted
There are innumerable stars in the sky.
天空中有无数颗星。
A myriad of lights twinkled like stars in the distance.
远处有无数盏灯像星星一样闪烁。
I'm not sure about [of] his ability to cope with this.
我对他应付此事的能力还心中无数。