9 ways to say I don't understand in Korean (and get people to slow down)
Nobody tells you how fast Korean is spoken until you are standing in front of it. The sentences you drilled arrive compressed, the particles vanish, and the speaker is already on to the next thought. The gap between a beginner who freezes and one who keeps the conversation going is usually a handful of recovery lines said without panic.
These nine are in the polite 요 form, which is right for strangers, shop staff, and anyone you have just met. They run roughly in order: first the ask to repeat, then the ask to slow down or explain, then the ones that reset the conversation on your terms.
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잘 못 알아들었어요.
jal mot aradeureosseoyo.
I didn't quite catch that.
Literally: (I) well not hear-understood.
The natural line for speech. 알아듣다 is understanding through the ear, so this says the words got past you, not that the idea is beyond you. 이해 못 했어요 is for a concept you cannot follow.
Ask Ipsae about this phrase → -
다시 한번 말해 주세요.
dasi hanbeon malhae juseyo.
Could you say that one more time?
Literally: Again one time say give-please.
A 죄송한데 (sorry, but) in front softens it for a stranger or someone older. Among friends 다시? on its own is enough.
Ask Ipsae about this phrase → -
천천히 말해 주세요.
cheoncheonhi malhae juseyo.
Please speak slowly.
조금만 천천히 (just a little slower) sounds less like an instruction. Koreans tend to repeat the same sentence at the same speed, so ask for slow explicitly.
Ask Ipsae about this phrase → -
네? 뭐라고요?
ne? mworagoyo?
Sorry, what?
Literally: Yes? What (did you) say?
네? with a rising tone already means pardon. 뭐라고요? is fine with peers and shopkeepers; with someone much older stop at 네? or use 다시 한번 말해 주세요.
Ask Ipsae about this phrase → -
무슨 뜻이에요?
museun tteusieyo?
What does that mean?
Literally: What meaning is it?
For one word or phrase you heard but did not know. Point at it or repeat it first: 이게 무슨 뜻이에요? (what does this mean?).
Ask Ipsae about this phrase → -
한국어 잘 못해요.
hangugeo jal motaeyo.
My Korean isn't very good.
Literally: Korean well not-do.
Say it early and people adjust without being asked. 한국어 못해요 without the 잘 sounds like you speak none, which the conversation itself contradicts.
Ask Ipsae about this phrase → -
영어로 해도 돼요?
yeongeoro haedo dwaeyo?
Is English okay?
Literally: Even if (I) do in English, is it fine?
Swap 영어 for your language: 스페인어로 (Spanish), 일본어로 (Japanese). Asking first, in Korean, gets a warmer reaction than switching mid-sentence.
Ask Ipsae about this phrase → -
써 주실 수 있어요?
sseo jusil su isseoyo?
Could you write it down?
Literally: Write give-can is-there?
For names, addresses and station names, where hearing a word once is not enough. 주실 수 있어요 is the deferential version of 주세요; 써 주세요 is fine with peers.
Ask Ipsae about this phrase → -
아, 이제 알겠어요.
a, ije algesseoyo.
Ah, now I get it.
Literally: Ah, now (I) will know.
Close the loop so the other person stops explaining. 알겠어요 is the polite acknowledgement; 알았어요 is the same idea but can sound curt to someone older.
Ask Ipsae about this phrase →
One pattern worth noticing: almost all of these end in 주세요 or 돼요, the two shapes a request takes in polite Korean. Learn to hear them and you will also start catching requests aimed at you. And the shortest tool of all is a rising 네? with a tilt of the head, which does the same work as every phrase above in one syllable.