A trivial matter; something small or petty that is not worth much concern.
そんな些事でくよくよするな。
Don't worry about such trivial matters.
会議では些事よりも重要な議題を先に扱ったほうがいい。
At the meeting, it's better to deal with important agenda items before trivial matters.
些事にこだわっていては時間が無駄だ。
If you fuss over trifles, it's a waste of time.