미안해 vs 죄송합니다: Which "Sorry" — and the One That Has No Casual Form

You looked up “sorry” and got two words: 미안해 and 죄송합니다. Nothing told you which one to use when — so you picked whichever came first, and sometimes it landed a little off.

It’s not that one is more sorry than the other. They’re both fully “sorry.” The choice is about something else entirely, and once you see what, it stops being a guess.

I’m Korean, and I apologize in both registers without thinking about it — so I can tell you what actually decides which one comes out, and the one trap that catches learners every time.

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The answer, up front

Both mean “sorry.” You don’t pick between them by how bad you feel — you pick by who you’re apologizing to. 죄송합니다 is the polite, formal one for people above you or people you don’t know. 미안해 is the casual, everyday one for friends and people close to you.

If you remember one thing: ==when you’re not sure, 죄송합니다 is never wrong.== It’s the one Koreans reach for with anyone they need to show respect to, and overshooting into formality costs you nothing.

It’s about the relationship, not the size of the mistake

Here’s the reframe that makes this click. Picking the wrong one doesn’t make you sound less sorry. It makes you sound like you misjudged the relationship.

Say 미안해 to your friend’s grandmother and you haven’t under-apologized — you’ve been too casual with an elder, which is a different kind of wrong. Say 죄송합니다 to your best friend and nothing breaks, but it sounds oddly stiff, like you’re addressing a stranger.

This is the same principle behind a lot of Korean: the word carries your read of the relationship, not just the meaning. So the question to ask before you apologize isn’t “how sorry am I?” It’s “who is this person to me?” — exactly like choosing 저 vs 나.

The two words even come from different roots. 미안 (未安) is literally “not at ease” — a soft, personal discomfort. 죄송 (罪悚) is closer to “I feel I’ve done wrong and am humbled by it” — heavier, more formal. You can hear the weight difference in where they come from.

The trap nobody warns you about: 죄송 has no casual form

This is the one that actually trips people up, and most guides skip it.

You learn that Korean verbs have a casual (반말) form — -요 drops off among close friends. So it’s natural to assume 죄송해요 → 죄송해 the way 미안해요 → 미안해.

It doesn’t work that way. Nobody uses a casual 죄송.

You can physically form 죄송해 — but say it to a friend and native speakers notice immediately, because it sounds weirdly formal and weirdly casual at the same time, in the same breath. ==For a close friend, the word is simply 미안해.== 죄송 lives in the polite-and-up world; it has no home in casual speech.

So the real map is cleaner than the three-row table above suggests:

• Formal / up / strangers → 죄송합니다 (or 죄송해요 when it’s polite but a little warmer)
• Casual / close / down → 미안해

If you catch yourself about to say 죄송해, you’ve mixed the registers. Switch the whole word to 미안해.

What to actually do

Not a list to memorize — a single question, then a fallback:

• Ask: who is this person to me? Above you, or a stranger → 죄송합니다. A close friend or someone younger → 미안해.
• Not sure? Use 죄송합니다. Too formal is harmless; too casual toward an elder is not.
• About to say 죄송해 to a friend? Don’t — nobody says it. Say 미안해.

That’s the whole thing. It feels like a vocabulary choice, but it’s really a relationship read — and the moment you stop asking “how sorry should I sound?” and start asking “who am I talking to?”, both words fall into place on their own.

Say the relationship, then the apology

Cover the table and choose a phrase before revealing the answer. Do not rate the size of the mistake; identify the relationship.

1. You bump into a stranger on the subway.
2. You reply late to a close friend.
3. You are about to tell that close friend 죄송해.

Check

1. 죄송합니다🔊 is the safe respectful choice.
2. 미안해🔊 fits the close, casual relationship.
3. Stop and switch the whole word: use 미안해🔊, not 죄송해.

Self-check: If you can make the choice from the person in front of you — not from “how sorry” you feel — you have learned the useful part of this pair.

And here’s a bonus: “thank you” splits the exact same way — casual 고마워, formal 감사합니다, the same casual-vs-formal split as 미안해 vs 죄송합니다. Learn one pair and you’ve basically learned the other.

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Every Korean example here was written from scratch and reviewed by a native speaker before publishing. The register split (formal 죄송 vs everyday 미안) and the fact that 죄송 has no casual 반말 form are how these words actually behave in daily speech, not a textbook rule — where usage is genuinely flexible, I’ve said “either is fine” rather than inventing a hard line.