Verbseoul.
하다 verb (adj)

심하다 conjugation (simhada, to be severe, to be extreme)

To say to be severe, to be extreme politely in the present tense, use 심해요 (sheem-hae-yoh) · simhaeyo. Below is the full conjugation of 심하다 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
심해
sheem-hae
simhae
심해요
sheem-hae-yoh
simhaeyo
심합니다
sheem-hahm-nee-dah
simhamnida
Past
심했어
sheem-hae-ssuh
simhaesseo
심했어요
sheem-hae-ssuh-yoh
simhaesseoyo
심했습니다
sheem-hae-sseum-nee-dah
simhaesseumnida
Future
심할 거야
sheem-hahl guh-yah
simhal geoya
심할 거예요
sheem-hahl guh-yae-yoh
simhal geoyeyo
심할 겁니다
sheem-hahl guhm-nee-dah
simhal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
심하세요
sheem-hah-sae-yoh
simhaseyo
Suggestion / Let's Polite (요)
심해요
sheem-hae-yoh
simhaeyo
Question Polite (요)
심해요?
sheem-hae-yoh-?
simhaeyo?
Connective "and" — (고)
심하고
sheem-hah-goh
simhago
Conditional "if" — (면)
심하면
sheem-hah-myuhn
simhamyeon
Progressive (고 있어요)
심하고 있어요
sheem-hah-goh ee-ssuh-yoh
simhago isseoyo
Want to (고 싶어요)
심하고 싶어요
sheem-hah-goh shee-puh-yoh
simhago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
심할 수 있어요
sheem-hahl soo ee-ssuh-yoh
simhal su isseoyo
Because / So (아/어서)
심해서
sheem-hae-suh
simhaeseo
Noun form — (기)
심하기
sheem-hah-gee
simhagi
Noun form — (음)
심함
sheem-hahm
simham