Verbseoul.
하다 verb (adj)
우울하다uulhadato be blue, to be depressed, to be melancholy

To say to be blue, to be depressed, to be melancholy politely in the present tense, use 우울해요 (oo-ool-hae-yoh). Below is the full conjugation of 우울하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
우울해
oo-ool-hae
우울해요
oo-ool-hae-yoh
우울합니다
oo-ool-hahm-nee-dah
Past
우울했어
oo-ool-hae-ssuh
우울했어요
oo-ool-hae-ssuh-yoh
우울했습니다
oo-ool-hae-sseum-nee-dah
Future
우울할 거야
oo-ool-hahl- -guh-yah
우울할 거예요
oo-ool-hahl- -guh-yae-yoh
우울할 겁니다
oo-ool-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
우울하세요
oo-ool-hah-sae-yoh
Suggestion / Let's Polite (요)
우울해요
oo-ool-hae-yoh
Question Polite (요)
우울해요?
oo-ool-hae-yoh-?
Connective “and” — (고)
우울하고
oo-ool-hah-goh
Conditional “if” — (면)
우울하면
oo-ool-hah-myuhn
Noun form — (기)
우울함
oo-ool-hahm