noun
something like that; that sort of thing
Used to refer to a thing or situation of a certain kind, often with a nuance of 'such a thing' or 'that kind of thing'. Can be used in both positive and negative contexts.
彼がそんなさることをするとは思わなかった。
I didn't think he would do something like that.
さることで悩むより、行動したほうがいい。
Rather than worrying about that sort of thing, it's better to take action.
noun
something natural; something plausible
Often used in the pattern さることながら to mean 'not only ... but also ...' or '... is natural/understandable, and moreover ...'. It acknowledges something as a matter of course while adding another point.
彼の才能もさることながら、努力も素晴らしい。
His talent is remarkable, but his effort is also wonderful.
味もさることながら、見た目も美しい料理だ。
It's a dish that not only tastes good but also looks beautiful.
From classical Japanese 然る (saru, 'such') + 事 (koto, 'thing'). The phrase has been used since the Heian period and retains a literary flavor in modern Japanese.