Verbseoul.
르 irregular (adj)
그르다geureudato be improper, to be wrong, to be incorrect (nowadays especially in a

To say to be improper, to be wrong, to be incorrect (nowadays especially in a politely in the present tense, use 글러요 (geul-ruh-yoh). Below is the full conjugation of 그르다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
글러
geul-ruh
글러요
geul-ruh-yoh
그릅니다
geu-reum-nee-dah
Past
글렀어
geul-ruh-ssuh
글렀어요
geul-ruh-ssuh-yoh
글렀습니다
geul-ruh-sseum-nee-dah
Future
그를 거야
geu-reul- -guh-yah
그를 거예요
geu-reul- -guh-yae-yoh
그를 겁니다
geu-reul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
그르세요
geu-reu-sae-yoh
Suggestion / Let's Polite (요)
글러요
geul-ruh-yoh
Question Polite (요)
글러요?
geul-ruh-yoh-?
Connective “and” — (고)
그르고
geu-reu-goh
Conditional “if” — (면)
그르면
geu-reu-myuhn
Noun form — (기)
그름
geu-reum