Verbseoul.
하다 verb (adj)
은밀하다eunmilhadato be secret, to be covert, to be clandestine

To say to be secret, to be covert, to be clandestine politely in the present tense, use 은밀해요 (eun-meel-hae-yoh). Below is the full conjugation of 은밀하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
은밀해
eun-meel-hae
은밀해요
eun-meel-hae-yoh
은밀합니다
eun-meel-hahm-nee-dah
Past
은밀했어
eun-meel-hae-ssuh
은밀했어요
eun-meel-hae-ssuh-yoh
은밀했습니다
eun-meel-hae-sseum-nee-dah
Future
은밀할 거야
eun-meel-hahl- -guh-yah
은밀할 거예요
eun-meel-hahl- -guh-yae-yoh
은밀할 겁니다
eun-meel-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
은밀하세요
eun-meel-hah-sae-yoh
Suggestion / Let's Polite (요)
은밀해요
eun-meel-hae-yoh
Question Polite (요)
은밀해요?
eun-meel-hae-yoh-?
Connective “and” — (고)
은밀하고
eun-meel-hah-goh
Conditional “if” — (면)
은밀하면
eun-meel-hah-myuhn
Noun form — (기)
은밀함
eun-meel-hahm