Verbseoul.
하다 verb (adj)
불길하다bulgilhadainauspicious, ominous, unlucky, sinister

To say inauspicious, ominous, unlucky, sinister politely in the present tense, use 불길해요 (bool-geel-hae-yoh). Below is the full conjugation of 불길하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
불길해
bool-geel-hae
불길해요
bool-geel-hae-yoh
불길합니다
bool-geel-hahm-nee-dah
Past
불길했어
bool-geel-hae-ssuh
불길했어요
bool-geel-hae-ssuh-yoh
불길했습니다
bool-geel-hae-sseum-nee-dah
Future
불길할 거야
bool-geel-hahl- -guh-yah
불길할 거예요
bool-geel-hahl- -guh-yae-yoh
불길할 겁니다
bool-geel-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
불길하세요
bool-geel-hah-sae-yoh
Suggestion / Let's Polite (요)
불길해요
bool-geel-hae-yoh
Question Polite (요)
불길해요?
bool-geel-hae-yoh-?
Connective “and” — (고)
불길하고
bool-geel-hah-goh
Conditional “if” — (면)
불길하면
bool-geel-hah-myuhn
Noun form — (기)
불길함
bool-geel-hahm