Verbseoul.
하다 verb (adj)
시무룩하다simurukhadato be sulky, to be morose

To say to be sulky, to be morose politely in the present tense, use 시무룩해요 (shee-moo-roo-kae-yoh). Below is the full conjugation of 시무룩하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
시무룩해
shee-moo-roo-kae
시무룩해요
shee-moo-roo-kae-yoh
시무룩합니다
shee-moo-roo-kahm-nee-dah
Past
시무룩했어
shee-moo-roo-kae-ssuh
시무룩했어요
shee-moo-roo-kae-ssuh-yoh
시무룩했습니다
shee-moo-roo-kae-sseum-nee-dah
Future
시무룩할 거야
shee-moo-roo-kahl- -guh-yah
시무룩할 거예요
shee-moo-roo-kahl- -guh-yae-yoh
시무룩할 겁니다
shee-moo-roo-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
시무룩하세요
shee-moo-roo-kah-sae-yoh
Suggestion / Let's Polite (요)
시무룩해요
shee-moo-roo-kae-yoh
Question Polite (요)
시무룩해요?
shee-moo-roo-kae-yoh-?
Connective “and” — (고)
시무룩하고
shee-moo-roo-kah-goh
Conditional “if” — (면)
시무룩하면
shee-moo-roo-kah-myuhn
Noun form — (기)
시무룩함
shee-moo-roo-kahm