Verbseoul.
하다 verb (adj)
신성하다sinseonghadasacred, holy

To say sacred, holy politely in the present tense, use 신성해요 (sheen-suhng-hae-yoh). Below is the full conjugation of 신성하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
신성해
sheen-suhng-hae
신성해요
sheen-suhng-hae-yoh
신성합니다
sheen-suhng-hahm-nee-dah
Past
신성했어
sheen-suhng-hae-ssuh
신성했어요
sheen-suhng-hae-ssuh-yoh
신성했습니다
sheen-suhng-hae-sseum-nee-dah
Future
신성할 거야
sheen-suhng-hahl- -guh-yah
신성할 거예요
sheen-suhng-hahl- -guh-yae-yoh
신성할 겁니다
sheen-suhng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
신성하세요
sheen-suhng-hah-sae-yoh
Suggestion / Let's Polite (요)
신성해요
sheen-suhng-hae-yoh
Question Polite (요)
신성해요?
sheen-suhng-hae-yoh-?
Connective “and” — (고)
신성하고
sheen-suhng-hah-goh
Conditional “if” — (면)
신성하면
sheen-suhng-hah-myuhn
Noun form — (기)
신성함
sheen-suhng-hahm