徒あだ事ごと

noun

trivial matter; trifle; unimportant thing

Refers to something insignificant or not worth serious attention. Often used in negative contexts to dismiss something as unimportant.

• そんなことは徒あだ事ごとだ。

  That's a trivial matter.

• 彼かれは徒あだ事ごとにこだわらない。

  He doesn't get hung up on trifles.