Verbseoul.
하다 verb (adj)
불규칙하다bulgyuchikhadairregular

To say irregular politely in the present tense, use 불규칙해요 (bool-gyoo-chee-kae-yoh). Below is the full conjugation of 불규칙하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
불규칙해
bool-gyoo-chee-kae
불규칙해요
bool-gyoo-chee-kae-yoh
불규칙합니다
bool-gyoo-chee-kahm-nee-dah
Past
불규칙했어
bool-gyoo-chee-kae-ssuh
불규칙했어요
bool-gyoo-chee-kae-ssuh-yoh
불규칙했습니다
bool-gyoo-chee-kae-sseum-nee-dah
Future
불규칙할 거야
bool-gyoo-chee-kahl- -guh-yah
불규칙할 거예요
bool-gyoo-chee-kahl- -guh-yae-yoh
불규칙할 겁니다
bool-gyoo-chee-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
불규칙하세요
bool-gyoo-chee-kah-sae-yoh
Suggestion / Let's Polite (요)
불규칙해요
bool-gyoo-chee-kae-yoh
Question Polite (요)
불규칙해요?
bool-gyoo-chee-kae-yoh-?
Connective “and” — (고)
불규칙하고
bool-gyoo-chee-kah-goh
Conditional “if” — (면)
불규칙하면
bool-gyoo-chee-kah-myuhn
Noun form — (기)
불규칙함
bool-gyoo-chee-kahm