That's a foolish action.

那是个愚蠢的行为。

youdao

Lying is one type of foolish action.

说谎也是一种的愚蠢的行为。

youdao

He deeply repented of his foolish action.

他对自己愚蠢的行为深感后悔。

youdao

That foolish action caused several problems for XM and dragged SIRI down with it.

FORBES: Magazine Article

The animated sequences that top, tail, and occasionally spice the action are a foolish joy.

NEWYORKER: Youth in Revolt

And though Monday night's postgame action was irrational and probably foolish (and possibly finable and suspendable) there's also the fact that the Knicks lost, which seems to have been forgotten it was exactly the kind of signal that Knicks fans have been hoping for.

WSJ: Carmelo Anthony Takes the Wheel