How to Apologize Sincerely in Japanese: 'I'm Really Sorry, It Was My Fault'
Learn to apologize sincerely in Japanese for serious mistakes: use 本当に申し訳ありません and 私の責任です, make amends, and avoid casual apologies.
By PookieFriends & plans · Yapr Learn
In Japanese, apologizing for a serious error requires more than a quick ごめん. You need formal, sincere language that shows you understand the gravity and take responsibility. This lesson teaches you how to say 'I'm really sorry, it was my fault' using 本当に申し訳ありません and 私の責任です. You'll learn when to use these versus casual apologies, how to make amends, and cultural nuances. By the end, you'll be able to apologize appropriately in professional or formal situations.
By the end, you can…
- apologize sincerely in Japanese using formal expressions.
- take responsibility by saying 'it was my fault' in Japanese.
- distinguish between casual and serious apologies in Japanese.
- make amends using appropriate Japanese phrases.
Listen once. Try it slowly. Then say it without looking.
Checking available voices…
本当に申し訳ありません。
I'm really sorry.
Hontō ni mōshiwake arimasen.
Very formal and sincere; use for serious mistakes to superiors or customers.
私の責任です。
It was my fault. / It is my responsibility.
Watashi no sekinin desu.
Explicitly takes responsibility; often used with a deep bow.
私が間違っていました。
I was wrong.
Watashi ga machigatte imashita.
Admits a specific error; use in formal or serious contexts.
今後このようなことがないようにいたします。
I will make sure this never happens again.
Kongo kono yō na koto ga nai yō ni itashimasu.
Promises improvement; often part of a formal apology.
どのようにお詫びすればよいか分かりません。
I don't know how to apologize enough.
Dono yō ni owabi sureba yoi ka wakarimasen.
Expresses deep remorse; very formal and humble.
Pronunciation guides are approximate. Slow playback keeps the original pitch.
Make it make sense
Useful pattern
To apologize sincerely, combine a strong apology with taking responsibility. A common pattern is: 本当に申し訳ありません。私の責任です。 (Hontō ni mōshiwake arimasen. Watashi no sekinin desu.) You can also add 私が間違っていました (Watashi ga machigatte imashita) to admit the specific error. For making amends, use 今後このようなことがないようにいたします (Kongo kono yō na koto ga nai yō ni itashimasu) to promise improvement. The formal apology 申し訳ありません (mōshiwake arimasen) is more serious than ごめんなさい (gomen nasai). Use it when the mistake has real consequences.
When to use it
Use these formal apologies in professional settings, with customers, or when you've caused significant trouble. For example, if you miss an important deadline, say to your boss: 本当に申し訳ありません。私の責任です。 (Hontō ni mōshiwake arimasen. Watashi no sekinin desu.) If you accidentally offend a friend seriously, you might still use 本当にごめん (Hontō ni gomen) but add 私が悪かった (Watashi ga warukatta). However, for serious errors, formal language shows respect. Avoid casual ごめん in business or with strangers. Also, a deep bow (お辞儀, ojigi) often accompanies these phrases.
Listen to each line, then take one part and reply out loud.
部長、本当に申し訳ありません。私が間違っていました。
Department manager, I'm really sorry. I was wrong.Buchō, hontō ni mōshiwake arimasen. Watashi ga machigatte imashita.何があったのですか。
What happened?Nani ga atta no desu ka.報告書に重大なミスがありました。私の責任です。今後このようなことがないようにいたします。
There was a serious mistake in the report. It was my fault. I will make sure this never happens again.Hōkokusho ni jūdai na misu ga arimashita. Watashi no sekinin desu. Kongo kono yō na koto ga nai yō ni itashimasu.分かりました。次は気をつけてください。
I understand. Please be careful next time.Wakarimashita. Tsugi wa ki o tsukete kudasai.A little context goes a long way
In Japanese culture, a sincere apology often includes a bow and may be accompanied by a small gift (お詫びの品, owabi no shina) for serious matters. The depth of the bow and the formality of language reflect the severity. Avoid making excuses; taking full responsibility is valued. Also, repeated apologies may be necessary to show sincerity.
One thing to watch for
Using casual ごめん (gomen) for a serious mistake at work.
Try this instead: Use 申し訳ありません (mōshiwake arimasen) or 本当に申し訳ありません (hontō ni mōshiwake arimasen) instead. For example, say to your boss: 本当に申し訳ありません。私の責任です。 (Hontō ni mōshiwake arimasen. Watashi no sekinin desu.)
Your turn
Try answering out loud before checking a possible answer.
1How do you say 'I'm really sorry' formally in Japanese?
Show a sample answer
本当に申し訳ありません。
This is a formal and sincere apology. 本当に (hontō ni) means 'really', and 申し訳ありません (mōshiwake arimasen) is a humble apology. Other variants like 誠に申し訳ありません (makoto ni mōshiwake arimasen) are also correct but more formal.
2What phrase means 'It was my fault' in Japanese?
Show a sample answer
私の責任です。
私の責任です (Watashi no sekinin desu) directly means 'It is my responsibility.' You could also say 私が悪かったです (Watashi ga warukatta desu) in less formal contexts, but 私の責任です is appropriate for serious errors.
3How do you promise to prevent a recurrence in Japanese?
Show a sample answer
今後このようなことがないようにいたします。
This phrase means 'I will make sure this never happens again.' It uses humble language (いたします, itashimasu) to show sincerity. A simpler form is 今後気をつけます (Kongo ki o tsukemasu), but the former is more formal.
For serious mistakes in Japanese, use 本当に申し訳ありません and 私の責任です to apologize sincerely and take responsibility. Avoid casual apologies, and consider making amends with a promise to improve.
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