입이 짧다 (ibi jjalda)

입이 짧다 (ibi jjalda) means that someone is picky about food and also eats only a little at a time. It’s the first phrase Koreans reach for when they see someone at the table whose chopsticks just aren’t moving. The person whose small plate is still untouched at a company dinner, the nephew who picks up a single sheet of seaweed even when ten side dishes are laid out, the coworker who says “저는 계란말이만 주세요” (jeoneun gyeranmariman juseyo) — “just the rolled omelet for me” — even when you take them to the hot new restaurant. In Korean, that person 입이 짧다.

Literally it’s “the mouth is short,” but what’s short here isn’t the mouth’s size or length. Read it as a picture — the range of food the mouth reaches is narrow — and the meaning lands all at once. The mouth can’t stretch out wide; it stops in front of just a few things.

The phrase has two axes. One is being picky, and the other is eating little. It’s most natural for someone who fits both, but it gets used when only one applies too. Someone who can’t handle strongly scented food — 입이 짧다. Someone who’s full after half a bowl of rice — also 입이 짧다.

What matters is the temperature. This phrase is not a criticism. It’s closer to a calm description of a person’s constitution or disposition. It sits less in the neighborhood of 저 사람 게을러 (jeo saram geeulleo) — “that guy’s lazy” — and more in the neighborhood of 저 사람 추위를 많이 타 (jeo saram chuwireul mani ta) — “she really feels the cold.” That’s why people use it about themselves without any hesitation. 제가 좀 입이 짧아서요 (jega jom ibi jjalbaseoyo) is an extremely common way to ask for understanding in advance when you know you’re going to leave food on your plate.

One more thing. This phrase points to a lasting tendency. You don’t use it for the state of being too full to eat today. Miss that distinction and the whole sentence goes sideways. We’ll come back to this below.

See It in a Real Conversation

Setting: Jun-kyung’s housewarming party. The table is piled high with food, but half an hour in, Emily’s plate is still almost exactly as it was.

Jun-kyung: 에밀리, 왜 이렇게 안 먹어? 입에 안 맞아? Emily, why aren’t you eating? Is it not to your taste?

Emily: 아니야, 진짜 맛있어. 내가 원래 좀 입이 짧아. No, it’s really good. I’m just a picky/small eater by nature.

Jun-kyung: 어? 너 저번에 삼겹살은 3인분 먹었잖아. Huh? You ate three servings of pork belly last time.

Emily: 그니까. 먹는 건 많이 먹는데 가리는 게 많아. 향 센 거를 잘 못 먹어. Right. I can eat a lot, but there’s a lot I won’t touch. Strong-smelling things I just can’t do.

Jun-kyung: 아, 그래서 쌀국수 남겼구나. 진작 말하지 그랬어. Ah, that’s why you left the pho. You should’ve said something sooner.

Emily: 말하면 괜히 유난 떠는 것 같잖아. 어릴 때부터 입이 짧다고 어른들한테 하도 들어서. If I say it, I feel like I’m being difficult. I heard “you’re a picky eater” from grown-ups my whole childhood.

Sentences That Sound Off

✗ 저 오늘 점심을 늦게 먹어서 입이 짧네요. (jeo oneul jeomsimeul neutge meogeoseo ibi jjalneyo.) ✓ 저 오늘 점심을 늦게 먹어서 별로 배가 안 고프네요. (jeo oneul jeomsimeul neutge meogeoseo byeollo baega an gopeuneyo.) — I ate lunch late today, so I’m not very hungry. → 입이 짧다 is a person’s ongoing tendency, not today’s condition. For a temporary can’t-eat situation, use 배가 부르다 (baega bureuda), “to be full,” or 입맛이 없다 (immasi eopda), “to have no appetite.”

✗ (to an elder you’re meeting for the first time) 어르신, 입이 짧으시네요. 왜 이렇게 안 드세요? (eoreusin, ibi jjalbeusineyo. wae ireoke an deuseyo?) ✓ (to an elder you’re meeting for the first time) 어르신, 혹시 못 드시는 거 있으세요? (eoreusin, hoksi mot deusineun geo isseuseyo?) — Is there anything you can’t eat? → The grammar is perfectly fine. The problem is that this phrase means I am judging your eating habits and putting a label on them, so said to someone’s face — especially someone older than you or someone you’ve just met — it comes across as butting in. This expression is safest when you use it about yourself or about a third party who isn’t in the room.

Example Sentences by Situation

① Talking about the kids — parents commiserating

우리 애가 입이 짧아서 반찬을 매번 다섯 가지씩 해요. uri aega ibi jjalbaseo banchaneul maebeon daseot gajissik haeyo. My kid is such a picky eater that I make five side dishes every single time.

The place this expression comes up most often in Korea is conversations about raising children. Worrying that your child doesn’t eat well is one of the classic parental anxieties, so “입이 짧다” travels with these conversations almost like a set phrase.

② Deciding on the menu for a work dinner — a considerate word

김 대리가 입이 짧으니까 오늘은 곱창 말고 무난한 데로 가자. Kim daeriga ibi jjalbeunikka oneureun gopchang malgo munanhan deuro gaja. Kim’s a picky eater, so let’s skip the tripe place and go somewhere safe today.

Here it’s used as consideration — making sure nobody gets left out when you pick a restaurant. The important point is that this is the context of looking after someone, not talking behind their back.

③ A hospital visit or checking in on an elder — the worried register

할머니가 요즘 입이 짧아지셔서 죽만 조금 드세요. harmeoniga yojeum ibi jjalbajyeoseoseo jungman jogeum deuseyo. Grandma’s appetite has gotten small lately, so she only has a bit of porridge.

Used in a change-of-state form like 입이 짧아지다 (ibi jjalbajida), it means the person used to eat well but doesn’t these days. There’s health worry underneath the sentence, which makes this the heaviest use in tone.

Polite vs. Casual Forms, and Similar Expressions

Casually you’d say 걔 입이 짧아 (gyae ibi jjalba); politely, 그분은 입이 짧으세요 (geubuneun ibi jjalbeuseyo) — it just follows ordinary adjective conjugation. When you’re talking about yourself, what people actually use most is 제가 좀 입이 짧습니다 (jega jom ibi jjalseumnida), or, more softly, 제가 좀 입이 짧은 편이에요 (jega jom ibi jjalbeun pyeonieyo). Adding ‘~인 편이다 (~in pyeonida)’, roughly “I tend to be…,” weakens the flat assertion and sounds far more modest.

Expression	Temperature & strength	Where it’s used
입이 짧다 (ibi jjalda)	Neutral. A calm tone that just describes a constitution	About yourself, family, or a third party who isn’t present. Not to an elder’s face
편식하다 (pyeonsikhada)	Slightly negative. Carries the nuance of a habit that ought to be fixed	Parent to child, health consultations. Said to an adult, it sounds like a lecture
입맛이 까다롭다 (immasi kkadaropda)	The strongest. Contains a judgment that the person is hard to please	Easily turns into gossip. Better avoided in front of the person
소식하다 (sosikhada)	Neutral to positive. Reads as healthy restraint	Health and diet talk. Covers only the “eats little” axis
먹성이 좋다 (meokseongi jota)	Positive. A hearty, open compliment	The opposite pole. “쟨 먹성이 좋아 (jyaen meokseongi joa)” is generally praise

Let’s also flag one pair that’s easy to mix up. 입이 가볍다 (ibi gabyeopda) means someone can’t keep a secret, and 입이 무겁다 (ibi mugeopda) is the opposite. Learners often confuse these with today’s phrase because the ‘mouth + adjective’ shape looks so similar, but it helps to bundle them like this: weight has to do with words, length has to do with food.

Cultural Background — The Table Is Where Feelings Get Measured

In Korea, eating well has long been a virtue. This is a country where the standard greeting is 밥 먹었어? (bap meogeosseo?) — “have you eaten?” — and where the sight that most warms a grandparent’s heart is a grandchild scraping a rice bowl clean. From the perspective of whoever set the table, leftover food isn’t just leftovers; it can turn into a small hurt, a quiet “did my care not reach you?”

That’s why “입이 짧다” goes beyond describing eating habits and also works as a shield. In front of an elder who keeps pressing more food on you, laying down the single line 제가 원래 입이 짧아서요 (jega wollae ibi jjalbaseoyo) means not “the food isn’t good” but “my body is just like this,” and the moment resolves without either side losing face. This is exactly why that one sentence is so useful for foreign learners — at a Korean table, it’s the shortest polite way to say “I’m going to stop eating now.”

This setup shows up in dramas all the time. A mother-in-law keeps nudging side dishes toward her daughter-in-law, and the daughter-in-law smiles and empties the plate little by little. On the surface, the lines are about someone not eating enough; what’s actually moving between them is emotional distance. In holiday specials and family dramas, this single scene often explains the entire relationship between two people.

One last note: there is no opposite expression “입이 길다 (ibi gilda).” It feels like there ought to be a matching phrase, but there isn’t. For someone who eats well, you use 먹성이 좋다 (meokseongi jota) from the table above, or 뭐든 잘 먹는다 (mwodeun jal meokneunda), “eats anything.” It’s a good example of how idioms aren’t built symmetrically.

Today’s Quiz

Which of the following uses 입이 짧다 naturally?

저 아까 간식을 많이 먹어서 지금 좀 입이 짧아요. (jeo akka gansigeul mani meogeoseo jigeum jom ibi jjalbayo.)
우리 조카는 입이 짧아서 김치찌개는 아예 안 먹어요. (uri jokaneun ibi jjalbaseo gimchijjigaeneun aye an meogeoyo.)
그 사람은 입이 짧아서 비밀을 절대 못 지켜요. (geu sarameun ibi jjalbaseo bimireul jeoldae mot jikyeoyo.)

Show the answer

The answer is 2.

Number 1 doesn’t work because it’s a temporary state of being full today. In that situation you’d say 입맛이 없어요 (immasi eopseoyo) or 배가 불러요 (baega bulleoyo). Number 3 has gotten mixed up with 입이 가볍다 (ibi gabyeopda). Not being able to keep a secret is about the mouth’s weight, not its length. Like number 2, this expression belongs where you’re describing an ongoing tendency to avoid certain foods.

Definitions and example sentences are from the National Institute of Korean Language’s Basic Korean Dictionary (krdict.korean.go.kr); that portion of this post, including our translations, is licensed under CC BY-SA 2.0 KR.