Verbseoul.
하다 verb (adj)
험악하다heomakhadadangerous, perilous

To say dangerous, perilous politely in the present tense, use 험악해요 (huh-mah-kae-yoh). Below is the full conjugation of 험악하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
험악해
huh-mah-kae
험악해요
huh-mah-kae-yoh
험악합니다
huh-mah-kahm-nee-dah
Past
험악했어
huh-mah-kae-ssuh
험악했어요
huh-mah-kae-ssuh-yoh
험악했습니다
huh-mah-kae-sseum-nee-dah
Future
험악할 거야
huh-mah-kahl- -guh-yah
험악할 거예요
huh-mah-kahl- -guh-yae-yoh
험악할 겁니다
huh-mah-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
험악하세요
huh-mah-kah-sae-yoh
Suggestion / Let's Polite (요)
험악해요
huh-mah-kae-yoh
Question Polite (요)
험악해요?
huh-mah-kae-yoh-?
Connective “and” — (고)
험악하고
huh-mah-kah-goh
Conditional “if” — (면)
험악하면
huh-mah-kah-myuhn
Noun form — (기)
험악함
huh-mah-kahm