Verbseoul.
ㅂ irregular (adj)

두껍다 conjugation (dukkeopda, to be thick)

To say to be thick politely in the present tense, use 두꺼워요 (doo-gguh-wuh-yoh) · dukkeowoyo. Below is the full conjugation of 두껍다 across the three tenses and three everyday speech levels.

Grammar note (ㅂ irregular (adj)): ㅂ-irregular adjectives follow the same rule as ㅂ-irregular verbs: the ㅂ changes to 우 when a vowel suffix follows. 덥다 (to be hot) becomes 더워요; 쉽다 (to be easy) becomes 쉬워요. The ㅂ is kept intact before consonant suffixes: 덥고, 쉽지. See all ㅂ-irregular verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
두꺼워
doo-gguh-wuh
dukkeowo
두꺼워요
doo-gguh-wuh-yoh
dukkeowoyo
두껍습니다
doo-gguhp-sseum-nee-dah
dukkeopsseumnida
Past
두꺼웠어
doo-gguh-wuh-ssuh
dukkeowosseo
두꺼웠어요
doo-gguh-wuh-ssuh-yoh
dukkeowosseoyo
두꺼웠습니다
doo-gguh-wuh-sseum-nee-dah
dukkeowosseumnida
Future
두꺼울 거야
doo-gguh-ool guh-yah
dukkeoul geoya
두꺼울 거예요
doo-gguh-ool guh-yae-yoh
dukkeoul geoyeyo
두꺼울 겁니다
doo-gguh-ool guhm-nee-dah
dukkeoul geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
두꺼우세요
doo-gguh-oo-sae-yoh
dukkeouseyo
Suggestion / Let's Polite (요)
두꺼워요
doo-gguh-wuh-yoh
dukkeowoyo
Question Polite (요)
두꺼워요?
doo-gguh-wuh-yoh-?
dukkeowoyo?
Connective "and" — (고)
두껍고
doo-gguhp-goh
dukkeopgo
Conditional "if" — (면)
두꺼우면
doo-gguh-oo-myuhn
dukkeoumyeon
Progressive (고 있어요)
두껍고 있어요
doo-gguhp-goh ee-ssuh-yoh
dukkeopgo isseoyo
Want to (고 싶어요)
두껍고 싶어요
doo-gguhp-goh shee-puh-yoh
dukkeopgo sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
두꺼울 수 있어요
doo-gguh-ool soo ee-ssuh-yoh
dukkeoul su isseoyo
Because / So (아/어서)
두꺼워서
doo-gguh-wuh-suh
dukkeowoseo
Noun form — (기)
두껍기
doo-gguhp-gee
dukkeopgi
Noun form — (음)
두꺼움
doo-gguh-oom
dukkeoum