Adjective Attributive -(으)ㄴ: 좋은, 예쁜, 큰

An adjective in Korean lives in two different places, and it changes shape depending on which one it's in. It can sit at the end of a sentence, doing the predicating — 이 방이 좋아요 ("this room is nice"). Or it can sit in front of a noun, describing it — 좋은 방 ("a nice room"). This second job, modifying a following noun, requires a special dress code: the attributive ending -(으)ㄴ. This page teaches that ending, why Korean needs it at all, and the reliable error it prevents.

Keep the guide's throughline in mind: Korean adjectives are descriptive verbs. That's exactly why they can't just lean against a noun the way English adjectives do. A "verb" has to be conjugated to modify a noun, and -(으)ㄴ is that conjugation — the present-tense attributive form of a descriptive verb.

The rule: -은 after a consonant, -ㄴ after a vowel

Attach the attributive ending to the adjective stem, choosing the shape by the stem's final sound:

• Consonant-final stem (batchim) → -은. 좋- → 좋은, 작- → 작은.
• Vowel-final stem → -ㄴ, tucked in as a batchim. 크- → 큰, 예쁘- → 예쁜.

Note 조용한: the 하다-adjective 조용하다 has a vowel stem (조용하-), so it takes -ㄴ → 조용한. The same batchim logic governs the whole class.

Two slots for one adjective: predicative vs. attributive

This is the concept to internalize, because English doesn't force the choice. The same adjective wears different endings depending on its position:

• Predicative (at the sentence end, doing the "is"): 사람이 좋아요 — "the person is nice."
• Attributive (before a noun, describing it): 좋은 사람 — "a nice person."

In the first sentence 작다 predicates, so it takes the 해요체 ending 작아요. In the second it modifies 방, so it takes the attributive 작은. The meaning of "small" is identical; only the grammatical job — and therefore the ending — changes. The end-of-sentence use has its own page, Predicative use of adjectives.

Why Korean needs a special ending here

English glues an adjective to a noun by bare adjacency ("a good person") and forms fuller descriptions with a relative pronoun ("a person who is good"). Korean does neither. It has no relative pronoun — no "who," "which," or "that" — and it will not let a bare 좋다 touch a noun. Instead, the describing word is conjugated into an attributive form and placed directly before the noun:

• English: a person [who is] good → Korean: 좋은 사람 = [good-ATTR] person

So -(으)ㄴ is doing the work that English splits between adjacency and "who is." There is nothing in 좋은 사람 that translates "who" or "is" — that meaning is folded into the ending -은. And the modifier always precedes the noun, however long it gets. This is the foundation of the whole Korean relative-clause system; see Putting a modifier before the noun.

A pronunciation note: 좋은 is said [조은]

Watch 좋은. The stem 좋- ends in ㅎ, and ㅎ deletes before a vowel, so 좋은 is pronounced [조은] — the ㅎ vanishes and the ㅈ links straight to 은. That's why the romanization is joeun, not "joheun." The same happens across the ㅎ-final adjectives: 많은 is [마는] maneun, 싫은 is [시른] sireun. You still write the ㅎ (it's part of the stem), but you don't say it.

The two big follow-ups (each its own page)

Two things complicate this clean picture, and both are important enough to get dedicated treatment:

1. Action verbs use a different attributive. An action verb modifying a noun in the present takes -는, not -(으)ㄴ: 먹는 사람 ("a person who is eating"), 가는 버스 ("the bus that's going"). Mixing these up — putting -는 on an adjective, or -(으)ㄴ on a present verb — is the classic error, and it gets the full treatment on Adjective -(으)ㄴ vs Verb -는. Preview: state → -(으)ㄴ, ongoing action → -는.

2. 있다/없다-adjectives break the rule. Any adjective built on 있다 or 없다 — 재미있다, 맛있다, 맛없다 — takes the verb-style -는 even though it describes a state: 재미있는 영화 ("an interesting movie"), never ×재미있은 영화. That systematic exception is covered on -있다/-없다 adjectives take -는.

Irregular stems (a quick preview)

A few stem types don't attach -(으)ㄴ regularly:

• ㄹ-stems drop the ㄹ: 길다 → 긴 (긴 머리 "long hair"), 멀다 → 먼 (먼 곳 "a faraway place").
• ㅂ-irregular adjectives turn ㅂ into 우: 춥다 → 추운 (추운 날 "a cold day"), 맵다 → 매운 (매운 음식 "spicy food"), 어렵다 → 어려운 (어려운 문제 "a hard problem").

These aren't chaos — they follow tidy sub-patterns laid out on Irregular attributives. For now, just know that 춥다 → 추운 (not ×춥은) and 길다 → 긴 (not ×길은) exist.

Common Mistakes

1. Leaving the adjective in dictionary form before a noun. A bare 좋다 can't modify a noun; it must become 좋은.

2. Leaving the adjective in its 해요체 form before a noun. 예뻐요 predicates; before a noun you need the attributive 예쁜.

3. Using the verb ending -는 on an adjective. A descriptive verb takes -(으)ㄴ, not -는.

4. Picking the wrong allomorph. A consonant stem takes -은 (작은), a vowel stem takes -ㄴ (큰); don't swap them.

Key Takeaways

• To modify a noun, an adjective takes the present attributive -(으)ㄴ: -은 after a consonant (좋은, 작은), -ㄴ after a vowel (큰, 예쁜).
• One adjective, two slots: predicative at the sentence end (방이 작아요) vs. attributive before a noun (작은 방).
• Korean has no relative pronoun; the modifier goes before the noun and -(으)ㄴ carries the whole "that is …" meaning — never ×좋다 사람 or ×좋아요 사람.
• Pronunciation: ㅎ-final stems lose the ㅎ before the vowel — 좋은 = [조은] joeun.
• Action verbs use -는 instead (먹는 사람), and 있다/없다-adjectives take -는 too (재미있는) — the two big follow-ups, each on its own page.