Verbseoul.
하다 verb (adj)
망연하다mangyeonhadaclueless

To say clueless politely in the present tense, use 망연해요 (mahng-yuhn-hae-yoh). Below is the full conjugation of 망연하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
망연해
mahng-yuhn-hae
망연해요
mahng-yuhn-hae-yoh
망연합니다
mahng-yuhn-hahm-nee-dah
Past
망연했어
mahng-yuhn-hae-ssuh
망연했어요
mahng-yuhn-hae-ssuh-yoh
망연했습니다
mahng-yuhn-hae-sseum-nee-dah
Future
망연할 거야
mahng-yuhn-hahl- -guh-yah
망연할 거예요
mahng-yuhn-hahl- -guh-yae-yoh
망연할 겁니다
mahng-yuhn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
망연하세요
mahng-yuhn-hah-sae-yoh
Suggestion / Let's Polite (요)
망연해요
mahng-yuhn-hae-yoh
Question Polite (요)
망연해요?
mahng-yuhn-hae-yoh-?
Connective “and” — (고)
망연하고
mahng-yuhn-hah-goh
Conditional “if” — (면)
망연하면
mahng-yuhn-hah-myuhn
Noun form — (기)
망연함
mahng-yuhn-hahm