How to Say "I Don't Know" in Korean

The everyday way to say it is 몰라요 (mollayo). Korean changes the ending depending on who you talk to, so here are the forms you'll actually hear.

Phrase · audio · pronunciation
Polite

몰라요

mollayo

Strangers, shop staff, coworkers and most adults. The safe default.

Formal

모르겠습니다

moreugetseumnida

Speeches, customers, older people and first meetings at work.

Casual

몰라

molla

Close friends, younger people and family.

When to use it

몰라요 can sound blunt; 잘 모르겠어요 is softer and more common with strangers.

Letter by letter: 몰라요

Korean is written in syllable blocks. Here is what each block of 몰라요 is made of.

BlockLettersSounds
몰ㅁ + ㅗ + ㄹㅁ m, ㅗ o, ㄹ l (at the end)
라ㄹ + ㅏㄹ r / l, ㅏ a
요ㅇ + ㅛㅇ silent, ㅛ yo

New to the letters? Tap through the Hangul chart to hear each one.

How to type it

On a standard Korean keyboard (2-set), press these keys in order:

AㅁHㅗFㄹFㄹKㅏDㅇYㅛ

Practice with the online Korean keyboard, or learn the layout in the typing test.

Frequently asked questions

How do you say "I don't know" in Korean?

The everyday polite way is 몰라요 (mollayo). The formal version is 모르겠습니다. With close friends, say 몰라.

How do you pronounce 몰라요?

It sounds like "mollayo". Press the speaker button on this page to hear it.

Romanization: Revised Romanization of Korean, with sound changes. Audio: a recorded native-sounding Korean voice.
Last checked: 2026-10-20