Verbseoul.
하다 verb (adj)

꿋꿋하다 conjugation (kkutkkuthada, strong)

To say strong politely in the present tense, use 꿋꿋해요 (ggoot-ggoo-tae-yoh) · kkutkkutaeyo. Below is the full conjugation of 꿋꿋하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb (adj)): 하다 adjectives use the same verb 하다 as a suffix to turn descriptive nouns into predicates (행복하다 = to be happy). They conjugate identically to 하다 verbs: the 하 contracts before -아/-어 suffixes to give 해. 행복해요, 행복했어요, 행복합니다. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
꿋꿋해
ggoot-ggoo-tae
kkutkkutae
꿋꿋해요
ggoot-ggoo-tae-yoh
kkutkkutaeyo
꿋꿋합니다
ggoot-ggoo-tahm-nee-dah
kkutkkutamnida
Past
꿋꿋했어
ggoot-ggoo-tae-ssuh
kkutkkutaesseo
꿋꿋했어요
ggoot-ggoo-tae-ssuh-yoh
kkutkkutaesseoyo
꿋꿋했습니다
ggoot-ggoo-tae-sseum-nee-dah
kkutkkutaesseumnida
Future
꿋꿋할 거야
ggoot-ggoo-tahl guh-yah
kkutkkutal geoya
꿋꿋할 거예요
ggoot-ggoo-tahl guh-yae-yoh
kkutkkutal geoyeyo
꿋꿋할 겁니다
ggoot-ggoo-tahl guhm-nee-dah
kkutkkutal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
꿋꿋하세요
ggoot-ggoo-tah-sae-yoh
kkutkkutaseyo
Suggestion / Let's Polite (요)
꿋꿋해요
ggoot-ggoo-tae-yoh
kkutkkutaeyo
Question Polite (요)
꿋꿋해요?
ggoot-ggoo-tae-yoh-?
kkutkkutaeyo?
Connective "and" — (고)
꿋꿋하고
ggoot-ggoo-tah-goh
kkutkkutago
Conditional "if" — (면)
꿋꿋하면
ggoot-ggoo-tah-myuhn
kkutkkutamyeon
Progressive (고 있어요)
꿋꿋하고 있어요
ggoot-ggoo-tah-goh ee-ssuh-yoh
kkutkkutago isseoyo
Want to (고 싶어요)
꿋꿋하고 싶어요
ggoot-ggoo-tah-goh shee-puh-yoh
kkutkkutago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
꿋꿋할 수 있어요
ggoot-ggoo-tahl soo ee-ssuh-yoh
kkutkkutal su isseoyo
Because / So (아/어서)
꿋꿋해서
ggoot-ggoo-tae-suh
kkutkkutaeseo
Noun form — (기)
꿋꿋하기
ggoot-ggoo-tah-gee
kkutkkutagi
Noun form — (음)
꿋꿋함
ggoot-ggoo-tahm
kkutkkutam