Verbseoul.
하다 verb (adj)

튼튼하다 conjugation (teunteunhada, sturdy, strong)

To say sturdy, strong politely in the present tense, use 튼튼해요 (teun-teun-hae-yoh) · teunteunhaeyo. Below is the full conjugation of 튼튼하다 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
튼튼해
teun-teun-hae
teunteunhae
튼튼해요
teun-teun-hae-yoh
teunteunhaeyo
튼튼합니다
teun-teun-hahm-nee-dah
teunteunhamnida
Past
튼튼했어
teun-teun-hae-ssuh
teunteunhaesseo
튼튼했어요
teun-teun-hae-ssuh-yoh
teunteunhaesseoyo
튼튼했습니다
teun-teun-hae-sseum-nee-dah
teunteunhaesseumnida
Future
튼튼할 거야
teun-teun-hahl guh-yah
teunteunhal geoya
튼튼할 거예요
teun-teun-hahl guh-yae-yoh
teunteunhal geoyeyo
튼튼할 겁니다
teun-teun-hahl guhm-nee-dah
teunteunhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
튼튼하세요
teun-teun-hah-sae-yoh
teunteunhaseyo
Suggestion / Let's Polite (요)
튼튼해요
teun-teun-hae-yoh
teunteunhaeyo
Question Polite (요)
튼튼해요?
teun-teun-hae-yoh-?
teunteunhaeyo?
Connective "and" — (고)
튼튼하고
teun-teun-hah-goh
teunteunhago
Conditional "if" — (면)
튼튼하면
teun-teun-hah-myuhn
teunteunhamyeon
Progressive (고 있어요)
튼튼하고 있어요
teun-teun-hah-goh ee-ssuh-yoh
teunteunhago isseoyo
Want to (고 싶어요)
튼튼하고 싶어요
teun-teun-hah-goh shee-puh-yoh
teunteunhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
튼튼할 수 있어요
teun-teun-hahl soo ee-ssuh-yoh
teunteunhal su isseoyo
Because / So (아/어서)
튼튼해서
teun-teun-hae-suh
teunteunhaeseo
Noun form — (기)
튼튼하기
teun-teun-hah-gee
teunteunhagi
Noun form — (음)
튼튼함
teun-teun-hahm
teunteunham