Inexcusable; unjustifiable; not to be excused.
彼の裏切りはすまない行為だと皆が言った。
Everyone said his betrayal was an inexcusable act.
あのような扱いは本当にすまないと思う。
I truly think that kind of treatment is inexcusable.
Sorry; remorseful; apologetic — expresses regret or apology.
遅れてしまって本当にすまない。電車が遅延していたんだ。
I'm really sorry I'm late. The train was delayed.
君に迷惑をかけてすまないと思っている。
I feel sorry for causing you trouble.
大事な会議を忘れてしまい、上司にすまないと謝った。
I forgot the important meeting and apologized to my boss, saying I was sorry.
An interjection used to say 'I'm sorry', 'excuse me', or occasionally 'thank you' in a concise, often slightly old-fashioned way.
すまない、手伝ってくれて本当に助かったよ。
Thanks — you really helped me. (literally: Sorry — you helped me a lot.)
道をふさいでしまってすまない。すぐどきます。
Sorry for blocking the way. I'll move right away.