Verbseoul.
ㅂ irregular (adj)
갑작스럽다gapjakseureopdato be sudden, abrupt, unexpected

To say to be sudden, abrupt, unexpected politely in the present tense, use 갑작스러워요 (gahp-chahg-sseu-ruh-wuh-yoh). Below is the full conjugation of 갑작스럽다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
갑작스러워
gahp-chahg-sseu-ruh-wuh
갑작스러워요
gahp-chahg-sseu-ruh-wuh-yoh
갑작스럽습니다
gahp-chahg-sseu-ruhp-sseum-nee-dah
Past
갑작스러웠어
gahp-chahg-sseu-ruh-wuh-ssuh
갑작스러웠어요
gahp-chahg-sseu-ruh-wuh-ssuh-yoh
갑작스러웠습니다
gahp-chahg-sseu-ruh-wuh-sseum-nee-dah
Future
갑작스러울 거야
gahp-chahg-sseu-ruh-ool- -guh-yah
갑작스러울 거예요
gahp-chahg-sseu-ruh-ool- -guh-yae-yoh
갑작스러울 겁니다
gahp-chahg-sseu-ruh-ool- -guhm-nee-dah

Other useful forms

Command Polite (세요)
갑작스러우세요
gahp-chahg-sseu-ruh-oo-sae-yoh
Suggestion / Let's Polite (요)
갑작스러워요
gahp-chahg-sseu-ruh-wuh-yoh
Question Polite (요)
갑작스러워요?
gahp-chahg-sseu-ruh-wuh-yoh-?
Connective “and” — (고)
갑작스럽고
gahp-chahg-sseu-ruhp-goh
Conditional “if” — (면)
갑작스러우면
gahp-chahg-sseu-ruh-oo-myuhn
Noun form — (기)
갑작스러움
gahp-chahg-sseu-ruh-oom