Verbseoul.
하다 verb (adj)
거만하다geomanhadato be arrogant, to be haughty, to be overweening

To say to be arrogant, to be haughty, to be overweening politely in the present tense, use 거만해요 (guh-mahn-hae-yoh). Below is the full conjugation of 거만하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
거만해
guh-mahn-hae
거만해요
guh-mahn-hae-yoh
거만합니다
guh-mahn-hahm-nee-dah
Past
거만했어
guh-mahn-hae-ssuh
거만했어요
guh-mahn-hae-ssuh-yoh
거만했습니다
guh-mahn-hae-sseum-nee-dah
Future
거만할 거야
guh-mahn-hahl- -guh-yah
거만할 거예요
guh-mahn-hahl- -guh-yae-yoh
거만할 겁니다
guh-mahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
거만하세요
guh-mahn-hah-sae-yoh
Suggestion / Let's Polite (요)
거만해요
guh-mahn-hae-yoh
Question Polite (요)
거만해요?
guh-mahn-hae-yoh-?
Connective “and” — (고)
거만하고
guh-mahn-hah-goh
Conditional “if” — (면)
거만하면
guh-mahn-hah-myuhn
Noun form — (기)
거만함
guh-mahn-hahm