Verbseoul.
ㅂ irregular (adj)
사납다sanapdato be harsh, to be wild, to be ferocious

To say to be harsh, to be wild, to be ferocious politely in the present tense, use 사나워요 (sah-nah-wuh-yoh). Below is the full conjugation of 사납다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
사나워
sah-nah-wuh
사나워요
sah-nah-wuh-yoh
사납습니다
sah-nahp-sseum-nee-dah
Past
사나웠어
sah-nah-wuh-ssuh
사나웠어요
sah-nah-wuh-ssuh-yoh
사나웠습니다
sah-nah-wuh-sseum-nee-dah
Future
사나울 거야
sah-nah-ool- -guh-yah
사나울 거예요
sah-nah-ool- -guh-yae-yoh
사나울 겁니다
sah-nah-ool- -guhm-nee-dah

Other useful forms

Command Polite (세요)
사나우세요
sah-nah-oo-sae-yoh
Suggestion / Let's Polite (요)
사나워요
sah-nah-wuh-yoh
Question Polite (요)
사나워요?
sah-nah-wuh-yoh-?
Connective “and” — (고)
사납고
sah-nahp-goh
Conditional “if” — (면)
사나우면
sah-nah-oo-myuhn
Noun form — (기)
사나움
sah-nah-oom