Verbseoul.
descriptive
굳세다gutsedato be firm, to be strong, to be steadfast

To say to be firm, to be strong, to be steadfast politely in the present tense, use 굳세요 (goot-sae-yoh). Below is the full conjugation of 굳세다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
굳세
goot-sae
굳세요
goot-sae-yoh
굳셉니다
goot-saem-nee-dah
Past
굳셌어
goot-sae-ssuh
굳셌어요
goot-sae-ssuh-yoh
굳셌습니다
goot-sae-sseum-nee-dah
Future
굳셀 거야
goot-sael- -guh-yah
굳셀 거예요
goot-sael- -guh-yae-yoh
굳셀 겁니다
goot-sael- -guhm-nee-dah

Other useful forms

Command Polite (세요)
굳세세요
goot-sae-sae-yoh
Suggestion / Let's Polite (요)
굳세요
goot-sae-yoh
Question Polite (요)
굳세요?
goot-sae-yoh-?
Connective “and” — (고)
굳세고
goot-sae-goh
Conditional “if” — (면)
굳세면
goot-sae-myuhn
Noun form — (기)
굳셈
goot-saem