두껍다 Korean adjective conjugation
to be thick
Every form of 두껍다 across the four speech levels. It is ㅂ irregular — ㅂ becomes 우 before a vowel: 춥다 → 추워요.
기본형Principal parts
The four forms the dictionary prints. Every other form on this page is derived from them.
- 관형사형Modifier
- 두꺼운
- 아/어Infinitive
- 두꺼워
- -으니Since
- 두꺼우니
- 합니다Formal
- 두껍습니다
현재Present
The tense that does the most work. 해요체 is the one to learn first — it is polite without being formal, and it is what most conversation is in.
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 서술Statement | 두꺼워요 | 두껍습니다 | 두꺼워 | 두껍다 |
과거Past
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 서술Statement | 두꺼웠어요 | 두꺼웠습니다 | 두꺼웠어 | 두꺼웠다 |
미래·추측Future & presumptive
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| -겠-Will / must be | 두껍겠어요 | 두껍겠습니다 | 두껍겠어 | 두껍겠다 |
| -을 것이다Going to | 두꺼울 거예요 | 두꺼울 것입니다 | 두꺼울 거야 | 두꺼울 것이다 |
의문Questions
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 현재Present | 두꺼워요? | 두껍습니까? | 두꺼워? | 두꺼우니? |
| 과거Past | 두꺼웠어요? | 두꺼웠습니까? | 두꺼웠어? | 두꺼웠니? |
부정Negation
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 안Not (short) | 안 두꺼워요 | 안 두껍습니다 | 안 두꺼워 | 안 두껍다 |
| -지 않다Not (long) | 두껍지 않아요 | 두껍지 않습니다 | 두껍지 않아 | 두껍지 않다 |
높임Honorific
| 해요체Polite | 합니다체Formal | 해체Casual | 한다체Plain | |
|---|---|---|---|---|
| 현재Present | 두꺼우세요 | 두꺼우십니다 | 두꺼우셔 | 두꺼우시다 |
| 과거Past | 두꺼우셨어요 | 두꺼우셨습니다 | 두꺼우셨어 | 두꺼우셨다 |
관형사형Modifying a noun
- 현재Present
- 두꺼운
- 과거Past
- 두꺼운
- 미래Future
- 두꺼울
- 회상Used to
- 두껍던
연결Joining clauses
- -고and
- 두껍고
- -게-ly / so that
- 두껍게
- -어서so / and then
- 두꺼워서
- -으니까since
- 두꺼우니까
- -으면if / when
- 두꺼우면
- -지만but
- 두껍지만
- -는데and / but (setting up)
- 두꺼운데
- -어도even if
- 두꺼워도
문형Sentence patterns
How the dictionary says this verb is used. The numbers are slots: 1 is the subject, 2 the object.
- 1이 두껍다
예문In real sentences
From the dictionary, each with its translation.
이 두꺼운 책의 중심 인물이 아서 왕이었음을 보아
The centerpiece of this tome was King Arthur.
오늘 추우니까 두껍게 입고 다녀.
It's cold today, so wear thick clothes.
이게 두껍고 좋아 보이는군요
Oh, wait, this looks promising. A nice, thick wire.
약간 더 두껍게 그리겠습니다.
I need to draw it a little thicker.
자주 묻는 질문Common questions
How do you conjugate 두껍다 in Korean?
두껍다 (to be thick) is 두꺼워요 in the polite 해요체, 두껍습니다 in formal 합니다체, 두꺼워 in casual 반말 and 두껍다 in the plain written style. The past is 두꺼웠어요.
What is the past tense of 두껍다?
두꺼웠어요 in everyday polite speech, 두꺼웠습니다 formally. It is built from the 아/어 form 두꺼워 plus ㅆ, which is why an irregular stem shows its irregularity here.
Is 두껍다 irregular?
Yes — it is ㅂ irregular (ㅂ 불규칙). ㅂ becomes 우 before a vowel: 춥다 → 추워요. That is why the stem looks different in 두꺼워 and 두꺼우니 but unchanged in 두껍습니다.
What TOPIK level is 두껍다?
2급 — TOPIK 2, elementary.
Dictionary form, meaning, sentence patterns, examples and audio from the 국립국어원 한국어기초사전, used under CC BY-SA 2.0 KR.
Conjugations are generated by this site's own engine and checked against the 9,380 forms the dictionary publishes on every build.