Verbseoul.
르 irregular (adj)
막다르다makdareudato be closed off, to be a dead-end

To say to be closed off, to be a dead-end politely in the present tense, use 막달라요 (mahg-dahl-rah-yoh). Below is the full conjugation of 막다르다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
막달라
mahg-dahl-rah
막달라요
mahg-dahl-rah-yoh
막다릅니다
mahg-dah-reum-nee-dah
Past
막달랐어
mahg-dahl-rah-ssuh
막달랐어요
mahg-dahl-rah-ssuh-yoh
막달랐습니다
mahg-dahl-rah-sseum-nee-dah
Future
막다를 거야
mahg-dah-reul- -guh-yah
막다를 거예요
mahg-dah-reul- -guh-yae-yoh
막다를 겁니다
mahg-dah-reul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
막다르세요
mahg-dah-reu-sae-yoh
Suggestion / Let's Polite (요)
막달라요
mahg-dahl-rah-yoh
Question Polite (요)
막달라요?
mahg-dahl-rah-yoh-?
Connective “and” — (고)
막다르고
mahg-dah-reu-goh
Conditional “if” — (면)
막다르면
mahg-dah-reu-myuhn
Noun form — (기)
막다름
mahg-dah-reum