Verbseoul.
하다 verb (adj)
불행하다bulhaenghadaunhappy, unfortunate

To say unhappy, unfortunate politely in the present tense, use 불행해요 (bool-haeng-hae-yoh). Below is the full conjugation of 불행하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
불행해
bool-haeng-hae
불행해요
bool-haeng-hae-yoh
불행합니다
bool-haeng-hahm-nee-dah
Past
불행했어
bool-haeng-hae-ssuh
불행했어요
bool-haeng-hae-ssuh-yoh
불행했습니다
bool-haeng-hae-sseum-nee-dah
Future
불행할 거야
bool-haeng-hahl- -guh-yah
불행할 거예요
bool-haeng-hahl- -guh-yae-yoh
불행할 겁니다
bool-haeng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
불행하세요
bool-haeng-hah-sae-yoh
Suggestion / Let's Polite (요)
불행해요
bool-haeng-hae-yoh
Question Polite (요)
불행해요?
bool-haeng-hae-yoh-?
Connective “and” — (고)
불행하고
bool-haeng-hah-goh
Conditional “if” — (면)
불행하면
bool-haeng-hah-myuhn
Noun form — (기)
불행함
bool-haeng-hahm