fool's errand

idiomatic

Japanese Meaning

無駄な仕事、目的も効果も期待できない愚かな取り組み / いたずらや悪ふざけとして与えられる、意味のない用事

Trying to convince them to change their minds felt like a fool's errand, but he kept arguing anyway.

彼らの考えを変えようとするのは無駄な試みに思えたが、彼はそれでも議論を続けた。

Sense（1）

(idiomatic) A foolish undertaking, especially one that is purposeless, fruitless, nonsensical, or certain to fail.

If I were to travel only that I might be discontented with that which I can get at home, methinks I should go but on a fool's errand.

Sense（2）

(idiomatic) Such an undertaking, assigned as a prank.

fools' errands

（ plural ）