Verbseoul.
descriptive
굳다gutdahard

To say hard politely in the present tense, use 굳어요 (goo-duh-yoh). Below is the full conjugation of 굳다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
굳어
goo-duh
굳어요
goo-duh-yoh
굳습니다
goot-seum-nee-dah
Past
굳었어
goo-duh-ssuh
굳었어요
goo-duh-ssuh-yoh
굳었습니다
goo-duh-sseum-nee-dah
Future
굳을 거야
goo-deul- -guh-yah
굳을 거예요
goo-deul- -guh-yae-yoh
굳을 겁니다
goo-deul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
굳으세요
goo-deu-sae-yoh
Suggestion / Let's Polite (요)
굳어요
goo-duh-yoh
Question Polite (요)
굳어요?
goo-duh-yoh-?
Connective “and” — (고)
굳고
goot-goh
Conditional “if” — (면)
굳으면
goo-deu-myuhn
Noun form — (기)
굳음
goo-deum