Nuance Dictionary / Sounds & Sensations
쿨쿨 kul-kul
The utterly heavy, motionless, and completely wiped-out sleep unique to exhausted babies, young children, and pets.
What does 쿨쿨 mean?
쿨쿨 (kul-kul) means: The utterly heavy, motionless, and completely wiped-out sleep unique to exhausted babies, young children, and pets.
When textbooks translate 쿨쿨 as a generic 'deeply' or 'soundly,' they rob you of the word's actual soul. Natives reach for 쿨쿨 specifically to narrate the absolute, defenseless dead-sleep of the small and innocent—creatures who played so hard they literally collapsed. It carries an intimate, affectionate warmth (*정*) that you reserve for beings exempt from adult survival anxieties; you would never use it to describe your exhausted boss or a stressed-out college student, as that would sound bizarrely infantilizing. If a learner uses it for an adult, it immediately exposes them as an outsider playing with childish sound effects rather than understanding social targets.
Other sides of 쿨쿨
◆ Playful Teasing of Adults — While toddlers sleep 'kul-kul' innocently, using it on a grown adult is a playful social weapon reserved for close circles where age or rank hierarchies are temporarily suspended. If you drop this on your boss or someone you're speaking jondaetmal to, it crosses the line from cute to condescending, signaling a total lack of nunchi. Natives reach for it during weekend group trips or group chats when an adult partner or close friend refuses to get out of bed, weaponizing childish onomatopoeia to puncture their adult dignity with affection.
How it's actually used
- 우리 강아지는 산책 다녀오더니 지금 쿨쿨 자고 있어.
u-ri gang-a-ji-neun san-chaek da-yeo-o-deon-i ji-geum kul-kul ja-go i-seo.
Our puppy went for a walk and is now fast asleep.
💡 Highlights the classic pairing of 쿨쿨 with exhausted pets completely knocked out after physical activity. - 아기가 놀다 지쳐서 쿨쿨 잠들었어요.
a-gi-ga nol-da ji-chyeo-seo kul-kul jam-deul-eot-seo-yo.
The baby got tired from playing and fell fast asleep.
💡 Shows polite usage when a mother or caregiver tenderly describes a child's sudden surrender to sleep. - 조용해, 동생 지금 쿨쿨 자는 중이니까.
jo-yong-hae, dong-saeng ji-geum kul-kul ja-neun jung-i-ni-ka.
Be quiet, my sibling is sleeping soundly right now.
💡 Uses banmal to command domestic quietness to protect the sacred, motionless sleep of a younger child.
Related words in Sounds & Sensations
몽글몽글 mong-geul-mong-geul너덜너덜 neo-deol-neo-deol느릿느릿 neu-rit-neu-rit오밀조밀 o-mil-jo-mil오손도손 o-son-do-son