Verbseoul.
descriptive

굵다 conjugation (gukda, to be thick)

To say to be thick politely in the present tense, use 굵어요 (gool-uh-yoh) · gueoyo. Below is the full conjugation of 굵다 across the three tenses and three everyday speech levels.

Grammar note (descriptive): Descriptive verbs (형용사) function like adjectives in Korean and conjugate the same way as regular action verbs. They cannot take the progressive -고 있어요 or imperative forms. 좋다 (to be good) → 좋아요; 크다 (to be big) → 커요 (으-irregular).

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

TenseCasual (반말)Polite (요)Formal (합니다)
Present
굵어
gool-uh
gueo
굵어요
gool-uh-yoh
gueoyo
굵습니다
gool-seum-nee-dah
guseumnida
Past
굵었어
gool-uh-ssuh
gueosseo
굵었어요
gool-uh-ssuh-yoh
gueosseoyo
굵었습니다
gool-uh-sseum-nee-dah
gueosseumnida
Future
굵을 거야
gool-eul guh-yah
gueul geoya
굵을 거예요
gool-eul guh-yae-yoh
gueul geoyeyo
굵을 겁니다
gool-eul guhm-nee-dah
gueul geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
굵으세요
gool-eu-sae-yoh
gueuseyo
Suggestion / Let's Polite (요)
굵어요
gool-uh-yoh
gueoyo
Question Polite (요)
굵어요?
gool-uh-yoh-?
gueoyo?
Connective "and" — (고)
굵고
gool-goh
gugo
Conditional "if" — (면)
굵으면
gool-eu-myuhn
gueumyeon
Progressive (고 있어요)
굵고 있어요
gool-goh ee-ssuh-yoh
gugo isseoyo
Want to (고 싶어요)
굵고 싶어요
gool-goh shee-puh-yoh
gugo sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
굵을 수 있어요
gool-eul soo ee-ssuh-yoh
gueul su isseoyo
Because / So (아/어서)
굵어서
gool-uh-suh
gueoseo
Noun form — (기)
굵기
gool-gee
gugi
Noun form — (음)
굵음
gool-eum
gueum