Verbseoul.
하다 verb (adj)
난치하다nanchihadato be intractable

To say to be intractable politely in the present tense, use 난치해요 (nahn-chee-hae-yoh). Below is the full conjugation of 난치하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
난치해
nahn-chee-hae
난치해요
nahn-chee-hae-yoh
난치합니다
nahn-chee-hahm-nee-dah
Past
난치했어
nahn-chee-hae-ssuh
난치했어요
nahn-chee-hae-ssuh-yoh
난치했습니다
nahn-chee-hae-sseum-nee-dah
Future
난치할 거야
nahn-chee-hahl- -guh-yah
난치할 거예요
nahn-chee-hahl- -guh-yae-yoh
난치할 겁니다
nahn-chee-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
난치하세요
nahn-chee-hah-sae-yoh
Suggestion / Let's Polite (요)
난치해요
nahn-chee-hae-yoh
Question Polite (요)
난치해요?
nahn-chee-hae-yoh-?
Connective “and” — (고)
난치하고
nahn-chee-hah-goh
Conditional “if” — (면)
난치하면
nahn-chee-hah-myuhn
Noun form — (기)
난치함
nahn-chee-hahm