Verbseoul.
descriptive
잽싸다jaepssadaquick, fast, nimble

To say quick, fast, nimble politely in the present tense, use 잽싸요 (chaep-ssah-yoh). Below is the full conjugation of 잽싸다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
잽싸
chaep-ssah
잽싸요
chaep-ssah-yoh
잽쌉니다
chaep-ssahm-nee-dah
Past
잽쌌어
chaep-ssah-ssuh
잽쌌어요
chaep-ssah-ssuh-yoh
잽쌌습니다
chaep-ssah-sseum-nee-dah
Future
잽쌀 거야
chaep-ssahl- -guh-yah
잽쌀 거예요
chaep-ssahl- -guh-yae-yoh
잽쌀 겁니다
chaep-ssahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
잽싸세요
chaep-ssah-sae-yoh
Suggestion / Let's Polite (요)
잽싸요
chaep-ssah-yoh
Question Polite (요)
잽싸요?
chaep-ssah-yoh-?
Connective “and” — (고)
잽싸고
chaep-ssah-goh
Conditional “if” — (면)
잽싸면
chaep-ssah-myuhn
Noun form — (기)
잽쌈
chaep-ssahm