Common Japanese Mistake: すみません (sumimasen) vs ごめんなさい (gomen nasai)

Two Apology Words — Very Different Uses

Both すみません and ごめんなさい are taught as “sorry/excuse me” in beginner Japanese, but using them interchangeably causes social friction. They have different levels of formality, different emotional weight, and different appropriate situations.

At a Glance

すみません: When to Use

• Getting someone’s attention: 「すみません、えきはどこですか？」(Excuse me, where’s the station?)
• Mild apology for a small inconvenience: 「おくれてすみません。」(Sorry I’m late.)
• Thanking someone for going to trouble: 「わざわざ すみません。」(You shouldn’t have.)
• Asking for something: 「すみません、みずをください。」(Excuse me, water please.)

ごめんなさい: When to Use

• Genuine apology for something you did wrong: 「うそをついて ごめんなさい。」(I’m sorry I lied.)
• Declining an invitation warmly: 「ごめんなさい、いけません。」(I’m sorry, I can’t make it.)
• Apologizing to a friend: 「わすれてた、ごめん！」(Casual: I forgot, sorry!)

What You Should NOT Do

ごめん vs ごめんなさい

ごめん is the casual shortened form, used between close friends and family. ごめんなさい adds formality. Use ごめんなさい when the situation calls for more genuine remorse or when speaking to someone you’re less close to.

Yuka Apologises With the Wrong Word

Mistakes feel embarrassing in the moment but they are the fastest way to learn. Watch how Yuka makes a natural error — and how Rei explains the rule clearly enough to prevent it from happening again.

Yuka

Rei, yesterday I bumped into someone on the street and said ごめんなさい. They looked a bit put off. What should I have said?

Rei

すみません! For stranger situations — bumping into people, interrupting, asking someone to move — すみません is the natural reflex. ごめんなさい carries more emotional weight; it sounds too intimate for a stranger encounter.

Yuka

When IS ごめんなさい appropriate then?

Rei

With people you’re close to — friends, family, romantic partners. If you forgot a friend’s birthday: ごめんなさい！わすれてしまった！ — ‘I’m sorry! I completely forgot!’ The sincerity and closeness it expresses fits personal relationships.

Yuka

And at work? I want to apologise professionally.

Rei

At work: もうしわけありません for genuine professional apologies. It means ‘I have no excuse’ and carries appropriate gravity. For small things at work — slightly interrupting, asking someone to repeat — すみません is still the go-to. Reserve もうしわけありません for real mistakes.

5 Correct Sentences — Read These Aloud

Each sentence demonstrates the correct usage from this article. Say them aloud to lock in the right pattern.

1. すみません、とおしてください。
   Excuse me, please let me through. (strangers, slight interruption)
2. ごめんなさい！やくそくをわすれてしまった。
   I’m so sorry! I forgot our promise. (close friend)
3. もうしわけありません。こんなことになってしまって。
   I have no excuse. I’m sorry things turned out this way. (professional)
4. すみません、もういちどおっしゃっていただけますか？
   Excuse me, could you say that once more?
5. おそくなって、もうしわけございませんでした。
   I am deeply sorry for being late. (formal professional)

Your Turn! Correct the Mistake in the Comments

Here is a sentence with the error from this article. Can you fix it? Write the corrected version — and your own correct sentence — in the comments below.

Other learners will read your explanation, and teaching is one of the deepest forms of learning. Log in to keep your comment history and appear in the Top Commenters sidebar ranking!

Keep Learning: Common Mistakes Hub | Grammar Guide | All Grammar Articles | Start Learning Japanese

📖 Want to take your Japanese further? Practice speaking with a professional Japanese tutor on italki — affordable 1-on-1 online lessons at your own pace.