Not being satisfied; unable to feel content or at ease — used when something remains unresolved or one feels dissatisfied.
彼にちゃんと謝ってもらわないと、私は気が済まない。
I won't be satisfied until he properly apologizes to me.
試合に負けたままだと気が済まないので、練習を続けている。
I can't be satisfied with losing the match, so I keep practicing.
約束の件がうまくいっていないので、どうしても気が済まない。
Because the promise hasn't been fulfilled properly, I just can't be at ease.