Verbseoul.
하다 verb (adj)
외설하다oeseolhadaobscene

To say obscene politely in the present tense, use 외설해요 (wae-suhl-hae-yoh). Below is the full conjugation of 외설하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
외설해
wae-suhl-hae
외설해요
wae-suhl-hae-yoh
외설합니다
wae-suhl-hahm-nee-dah
Past
외설했어
wae-suhl-hae-ssuh
외설했어요
wae-suhl-hae-ssuh-yoh
외설했습니다
wae-suhl-hae-sseum-nee-dah
Future
외설할 거야
wae-suhl-hahl- -guh-yah
외설할 거예요
wae-suhl-hahl- -guh-yae-yoh
외설할 겁니다
wae-suhl-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
외설하세요
wae-suhl-hah-sae-yoh
Suggestion / Let's Polite (요)
외설해요
wae-suhl-hae-yoh
Question Polite (요)
외설해요?
wae-suhl-hae-yoh-?
Connective “and” — (고)
외설하고
wae-suhl-hah-goh
Conditional “if” — (면)
외설하면
wae-suhl-hah-myuhn
Noun form — (기)
외설함
wae-suhl-hahm