KoreanSum

Adjectives · 하다 word

시원하다 conjugation

to be cool; refreshing · siwonhada · sounds like [시원하다]

Short answer: “Cool” in Korean is 시원하다 (siwonhada), which also means refreshing. Polite present: 시원해요 (siwonhaeyo); past: 시원했어요 (siwonhaesseoyo); future: 시원할 거예요. It is a 하다 adjective: 하 + 아/어 always becomes 해.

시원하다 in sentences

All forms of 시원하다

Present
Polite (해요) is the everyday safe choice; formal (합니다) is for news, announcements and work; casual (반말) is for close friends and younger people.
FormKoreanSounds likeRomanized
polite-아/어요시원해요[시원해요]siwonhaeyo
formal-(스)ㅂ니다시원합니다[시원함니다]siwonhamnida
casual-아/어시원해[시원해]siwonhae
plain (written)-다시원하다[시원하다]siwonhada
formal question-(스)ㅂ니까?시원합니까?[시원함니까]siwonhamnikka?
Past
FormKoreanSounds likeRomanized
polite-았/었어요시원했어요[시원해써요]siwonhaesseoyo
formal-았/었습니다시원했습니다[시원핻씀니다]siwonhaetseumnida
casual-았/었어시원했어[시원해써]siwonhaesseo
plain (written)-았/었다시원했다[시원핻따]siwonhaetda
Future
FormKoreanSounds likeRomanized
polite — will probably be-(으)ㄹ 거예요시원할 거예요[시원할 꺼예요]siwonhal geoyeyo
formal-(으)ㄹ 겁니다시원할 겁니다[시원할 껌니다]siwonhal geomnida
casual-(으)ㄹ 거야시원할 거야[시원할 꺼야]siwonhal geoya
Negative
FormKoreanSounds likeRomanized
not (short)안 …안 시원해요[안 시원해요]an siwonhaeyo
did not안 …았/었어요안 시원했어요[안 시원해써요]an siwonhaesseoyo
not (long)-지 않아요시원하지 않아요[시원하지 아나요]siwonhaji anayo
Honorific
Add -(으)시- when the subject is someone you respect (a teacher, a customer, an older person) — not yourself.
FormKoreanSounds likeRomanized
honorific — present-(으)세요시원하세요[시원하세요]siwonhaseyo
honorific — past-(으)셨어요시원하셨어요[시원하셔써요]siwonhasyeosseoyo
honorific — formal-(으)십니다시원하십니다[시원하심니다]siwonhasimnida
Connecting
FormKoreanSounds likeRomanized
… and-고시원하고[시원하고]siwonhago
… so / and then-아/어서시원해서[시원해서]siwonhaeseo
if …-(으)면시원하면[시원하면]siwonhamyeon
… but-지만시원하지만[시원하지만]siwonhajiman
because …-(으)니까시원하니까[시원하니까]siwonhanikka
… and / but (background)-(으)ㄴ데시원한데[시원한데]siwonhande
even if …-아/어도시원해도[시원해도]siwonhaedo
while …-(으)면서시원하면서[시원하면서]siwonhamyeonseo
Describing a noun
These go before a noun: “the food (that) I ate”, “a cold day”.
FormKoreanSounds likeRomanized
(that is) …-(으)ㄴ시원한[시원한]siwonhan
(that) will …-(으)ㄹ시원할[시원할]siwonhal
Useful patterns
FormKoreanSounds likeRomanized
can be …-(으)ㄹ 수 있어요시원할 수 있어요[시원할 쑤 이써요]siwonhal su isseoyo
cannot be …-(으)ㄹ 수 없어요시원할 수 없어요[시원할 쑤 업써요]siwonhal su eopseoyo
have to be …-아/어야 해요시원해야 해요[시원해야 해요]siwonhaeya haeyo
it’s OK if it’s …-아/어도 돼요시원해도 돼요[시원해도 돼요]siwonhaedo dwaeyo
…ly (adverb)-게시원하게[시원하게]siwonhage
becomes …-아/어지다시원해져요[시원해저요]siwonhaejeoyo
…ing (noun)-기시원하기[시원하기]siwonhagi

How 시원하다 changes

Every 하다 word works the same way: 하 + 여 becomes 해 → 시원해요, 시원했어요. With other endings 하 stays as it is: 시원합니다, 시원하면.

How every verb type works → · Why it sounds like that →

Questions

How do you say “cool” in Korean?

“Cool” is 시원하다 (siwonhada), pronounced [시원하다]. In a sentence: 바람이 시원해요. — The breeze is cool.

What is the past tense of 시원하다?

시원했어요 (siwonhaesseoyo) is the polite past tense of 시원하다 (“to be cool”). Formal: 시원했습니다; casual: 시원했어.

How do you say 시원하다 politely?

Everyday polite: 시원해요 (siwonhaeyo). Formal: 시원합니다. Casual, with close friends: 시원해.

How do you say “not cool” in Korean?

안 시원해요 or 시원하지 않아요. Both mean the same; the first is more common in speech.

Is 시원하다 irregular?

No. Every 하다 word works the same way: 하 + 여 becomes 해 → 시원해요, 시원했어요. With other endings 하 stays as it is: 시원합니다, 시원하면.

More 하다 words like 시원하다

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Forms follow 한글 맞춤법 (Korean spelling rules); pronunciation follows 표준 발음법 and romanization follows 국어의 로마자 표기법 (Revised Romanization). Last updated October 16, 2026. How we check