Verbseoul.
하다 verb (adj)
어눌하다eonulhadato be inarticulate (in speech)

To say to be inarticulate (in speech) politely in the present tense, use 어눌해요 (uh-nool-hae-yoh). Below is the full conjugation of 어눌하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
어눌해
uh-nool-hae
어눌해요
uh-nool-hae-yoh
어눌합니다
uh-nool-hahm-nee-dah
Past
어눌했어
uh-nool-hae-ssuh
어눌했어요
uh-nool-hae-ssuh-yoh
어눌했습니다
uh-nool-hae-sseum-nee-dah
Future
어눌할 거야
uh-nool-hahl- -guh-yah
어눌할 거예요
uh-nool-hahl- -guh-yae-yoh
어눌할 겁니다
uh-nool-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
어눌하세요
uh-nool-hah-sae-yoh
Suggestion / Let's Polite (요)
어눌해요
uh-nool-hae-yoh
Question Polite (요)
어눌해요?
uh-nool-hae-yoh-?
Connective “and” — (고)
어눌하고
uh-nool-hah-goh
Conditional “if” — (면)
어눌하면
uh-nool-hah-myuhn
Noun form — (기)
어눌함
uh-nool-hahm