Korean splits these into two kinds: 의성어 (uiseongeo), words that copy a sound — 멍멍 (woof), 쨍그랑 (glass shattering) — and 의태어 (uitaeeo), words that copy a manner with no sound at all — 반짝반짝 (twinkling), 살금살금 (sneaking), 두근두근 (heart pounding). The second group is the one English mostly lacks, and it is enormous in Korean.
English has “bang” and “splash” and then runs out. Korean has a word for the specific crispness of biting a fresh apple (사각사각), for a toddler’s unsteady walk (아장아장), and for the way soft things sit in gentle lumps (몽글몽글). What makes them learnable rather than overwhelming is that they are not arbitrary: two systematic sound rules let one root generate an entire family, and once you know the rules you can often guess a word you have never met.
의성어 — words that copy a sound
| Korean | Romanization | What it is |
|---|---|---|
| 멍멍 | meongmeong | a dog barking — Korean “woof woof” |
| 야옹 | yaong | a cat’s meow |
| 꼬끼오 | kkokkio | a rooster crowing |
| 짹짹 | jjaekjjaek | small birds chirping |
| 쨍그랑 | jjaenggeurang | glass or metal shattering on the floor |
| 후루룩 | hururuk | slurping noodles or soup — not rude in Korea |
| 콜록콜록 | kollokkollok | a dry repeated cough |
| 훌쩍훌쩍 | huljjeokhuljjeok | sniffling, quiet crying |
| 사각사각 | sagaksagak | crisp crunching — biting an apple, walking on fresh snow |
| 소곤소곤 | sogonsogon | whispering quietly together |
사각사각 is a good example of how specific these get: it is the sound of something crisp yielding cleanly. Korean speakers use it for apples, cucumbers, fresh snow underfoot and pencil on paper — all the same texture of sound.
의태어 — words that copy a manner
These describe how something looks, moves or feels. Nothing here makes a noise, which is what makes the category so foreign to English speakers.
| Korean | Romanization | What it describes |
|---|---|---|
| 반짝반짝 | banjjakbanjjak | twinkling, sparkling — stars, clean dishes, eyes |
| 두근두근 | dugeundugeun | a pounding heart — nerves, excitement, attraction |
| 살금살금 | salgeumsalgeum | moving stealthily so as not to be noticed |
| 아장아장 | ajangajang | a toddler’s unsteady waddling walk |
| 엉금엉금 | eonggeumeonggeum | crawling slowly and heavily |
| 방긋방긋 | banggeutbanggeut | smiling brightly without a sound |
| 울퉁불퉁 | ultungbultung | bumpy, uneven — a road, a surface |
| 흔들흔들 | heundeulheundeul | swaying or wobbling back and forth |
| 몽글몽글 | monggeulmonggeul | soft rounded lumps — clouds, cooked egg, a full feeling |
| 뭉게뭉게 | munggemungge | billowing upward in soft masses — clouds, smoke |
| 대롱대롱 | daerongdaerong | dangling from something |
| 꼬물꼬물 | kkomulkkomul | wriggling slowly — insects, babies’ fingers |
| 폭신폭신 | poksinpoksin | soft and springy — a cushion, fresh bread |
| 촉촉 | chokchok | pleasantly moist — skin, cake |
| 깜빡 | kkamppak | blinking — and also forgetting something momentarily |
깜빡 shows how far these travel from sound: it is a blink of the eyes or a light, and by extension the moment your memory blinks — 깜빡했어요 is the everyday way to say “it slipped my mind.”
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Try the free Hangul quizThe rule that makes them learnable: bright vowels and dark vowels
This is the part most word lists leave out, and it is the single most useful thing on this page.
Korean sorts vowels into bright (ㅏ, ㅗ) and dark (ㅓ, ㅜ). Swap one for the other in a mimetic word and you keep the meaning but change the scale: bright vowels feel small, light, quick and often cuter; dark vowels feel large, heavy, slow and more serious.
| Bright | Dark | The difference |
|---|---|---|
| 반짝 banjjak | 번쩍 beonjjeok | a small sparkle vs a big sudden flash |
| 찰랑 challang | 출렁 chulleong | water lapping vs water sloshing heavily |
| 살금 salgeum | 슬금 seulgeum | tiptoeing vs sidling away |
| 알록달록 allokdallok | 얼룩덜룩 eollukdeolluk | prettily multicoloured vs blotchy and stained |
| 퐁당 pongdang | 풍덩 pungdeong | a pebble dropping in vs a body plunging in |
Note 알록달록 versus 얼룩덜룩 especially: the same pattern, but one is a compliment about colour and the other means blotchy. The vowel carries the judgement.
The second rule: consonant intensity
Korean has three-way consonant sets — plain, tense and aspirated — and mimetic words use all three to add force.
Same word, three strengths
- 방긋 (banggeut) — a gentle, soft smile
- 빵긋 (ppanggeut) — brighter and more sudden, tense consonant
- 팡긋 (panggeut) — breathier and more open, aspirated
The same applies elsewhere: 깜빡 is a sharper blink than 감빡 would be, and tense consonants generally read as tighter, faster and more emphatic. Combine both rules and a single root can produce eight or more distinct, real, dictionary-listed words.
How to actually use them
Four practical notes
- Most attach to 하다 or a verb. 반짝반짝 빛나다 (shine sparklingly), 두근두근하다 (to have one’s heart pound). They rarely stand alone as the whole sentence except in comics and captions.
- Doubling is the default. 반짝 alone means a single flash; 반짝반짝 means repeated twinkling. The doubled form is usually what you want.
- They are standard vocabulary, not slang. They appear in literature and in the dictionary — but they are rare in formal reports, so match the register.
- Guess before you look up. Once the two rules are internalised, an unfamiliar mimetic word is often decodable from its vowels and consonants alone. That is how native speakers handle the long tail.
Hear them, then they stick
Sound-symbolic words are almost impossible to learn from romanization — the whole point is the sound. Hanguljo gives every word native audio, a hand-written mnemonic and a place in one SRS schedule, alongside natural conversation lessons across a full TOPIK 1–6 path.
Learn Korean with Hanguljo - FreeSources
Every word listed here is a headword in the National Institute of Korean Language’s Standard Korean Language Dictionary, with additional senses and regional forms checked against the open dictionary Urimalsaem. Romanization follows the official Revised Romanization of Korean.
The bright/dark vowel distinction described above is the traditional 양성모음 / 음성모음 analysis used in Korean grammar teaching. It is a strong tendency rather than an exceptionless law — a handful of words do not follow it — so we have described it as a reliable guide, not a rule without exceptions.
Frequently asked questions
What does 두근두근 mean?
A pounding heart, from nerves, excitement or attraction. One of the most common words in K-drama dialogue and lyrics, used for both the physical sensation and the feeling.
What is the difference between 의성어 and 의태어?
의성어 imitates a real sound; 의태어 describes a manner or appearance that makes no sound. Korean has an unusually large stock of the second kind.
Is 후루룩 rude?
No. Slurping noodles is normal in Korea and the word carries no negative sense — if anything it suggests the food is good.
How many should I learn?
Twenty or so common ones, plus the two sound rules. The rules matter more than the list, because they let you decode words you have not seen.
Do Japanese and Chinese have these?
Japanese does, extensively — giseigo and gitaigo work almost identically, including the manner-words category. Chinese has far fewer. See our sister site on Japanese.