Verbseoul.
하다 verb (adj)
위험하다wiheomhadadangerous

To say dangerous politely in the present tense, use 위험해요 (wee-huhm-hae-yoh). Below is the full conjugation of 위험하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
위험해
wee-huhm-hae
위험해요
wee-huhm-hae-yoh
위험합니다
wee-huhm-hahm-nee-dah
Past
위험했어
wee-huhm-hae-ssuh
위험했어요
wee-huhm-hae-ssuh-yoh
위험했습니다
wee-huhm-hae-sseum-nee-dah
Future
위험할 거야
wee-huhm-hahl- -guh-yah
위험할 거예요
wee-huhm-hahl- -guh-yae-yoh
위험할 겁니다
wee-huhm-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
위험하세요
wee-huhm-hah-sae-yoh
Suggestion / Let's Polite (요)
위험해요
wee-huhm-hae-yoh
Question Polite (요)
위험해요?
wee-huhm-hae-yoh-?
Connective “and” — (고)
위험하고
wee-huhm-hah-goh
Conditional “if” — (면)
위험하면
wee-huhm-hah-myuhn
Noun form — (기)
위험함
wee-huhm-hahm