Verbseoul.
르 irregular
거스르다geoseureudato disobey, to defy, to go against

To say to disobey, to defy, to go against politely in the present tense, use 거슬러요 (guh-seul-ruh-yoh). Below is the full conjugation of 거스르다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
거슬러
guh-seul-ruh
거슬러요
guh-seul-ruh-yoh
거스릅니다
guh-seu-reum-nee-dah
Past
거슬렀어
guh-seul-ruh-ssuh
거슬렀어요
guh-seul-ruh-ssuh-yoh
거슬렀습니다
guh-seul-ruh-sseum-nee-dah
Future
거스를 거야
guh-seu-reul- -guh-yah
거스를 거예요
guh-seu-reul- -guh-yae-yoh
거스를 겁니다
guh-seu-reul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
거스르세요
guh-seu-reu-sae-yoh
Suggestion / Let's Polite (요)
거슬러요
guh-seul-ruh-yoh
Question Polite (요)
거슬러요?
guh-seul-ruh-yoh-?
Connective “and” — (고)
거스르고
guh-seu-reu-goh
Conditional “if” — (면)
거스르면
guh-seu-reu-myuhn
Noun form — (기)
거스름
guh-seu-reum