Verbseoul.
하다 verb (adj)
침울하다chimulhadato be down, to be dismal, to be depressed

To say to be down, to be dismal, to be depressed politely in the present tense, use 침울해요 (chee-mool-hae-yoh). Below is the full conjugation of 침울하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
침울해
chee-mool-hae
침울해요
chee-mool-hae-yoh
침울합니다
chee-mool-hahm-nee-dah
Past
침울했어
chee-mool-hae-ssuh
침울했어요
chee-mool-hae-ssuh-yoh
침울했습니다
chee-mool-hae-sseum-nee-dah
Future
침울할 거야
chee-mool-hahl- -guh-yah
침울할 거예요
chee-mool-hahl- -guh-yae-yoh
침울할 겁니다
chee-mool-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
침울하세요
chee-mool-hah-sae-yoh
Suggestion / Let's Polite (요)
침울해요
chee-mool-hae-yoh
Question Polite (요)
침울해요?
chee-mool-hae-yoh-?
Connective “and” — (고)
침울하고
chee-mool-hah-goh
Conditional “if” — (면)
침울하면
chee-mool-hah-myuhn
Noun form — (기)
침울함
chee-mool-hahm