Verbseoul.
ㅂ irregular (adj)
더럽다deoreopdato be dirty

To say to be dirty politely in the present tense, use 더러워요 (duh-ruh-wuh-yoh). Below is the full conjugation of 더럽다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
더러워
duh-ruh-wuh
더러워요
duh-ruh-wuh-yoh
더럽습니다
duh-ruhp-sseum-nee-dah
Past
더러웠어
duh-ruh-wuh-ssuh
더러웠어요
duh-ruh-wuh-ssuh-yoh
더러웠습니다
duh-ruh-wuh-sseum-nee-dah
Future
더러울 거야
duh-ruh-ool- -guh-yah
더러울 거예요
duh-ruh-ool- -guh-yae-yoh
더러울 겁니다
duh-ruh-ool- -guhm-nee-dah

Other useful forms

Command Polite (세요)
더러우세요
duh-ruh-oo-sae-yoh
Suggestion / Let's Polite (요)
더러워요
duh-ruh-wuh-yoh
Question Polite (요)
더러워요?
duh-ruh-wuh-yoh-?
Connective “and” — (고)
더럽고
duh-ruhp-goh
Conditional “if” — (면)
더러우면
duh-ruh-oo-myuhn
Noun form — (기)
더러움
duh-ruh-oom