Verbseoul.
descriptive
뜬금없다tteungeumeopdarandomly, unexpectedly, without warning

To say randomly, unexpectedly, without warning politely in the present tense, use 뜬금없어요 (tteun-geu-muhp-ssuh-yoh). Below is the full conjugation of 뜬금없다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
뜬금없어
tteun-geu-muhp-ssuh
뜬금없어요
tteun-geu-muhp-ssuh-yoh
뜬금없습니다
tteun-geu-muhp-seum-nee-dah
Past
뜬금없었어
tteun-geu-muhp-ssuh-ssuh
뜬금없었어요
tteun-geu-muhp-ssuh-ssuh-yoh
뜬금없었습니다
tteun-geu-muhp-ssuh-sseum-nee-dah
Future
뜬금없을 거야
tteun-geu-muhp-sseul- -guh-yah
뜬금없을 거예요
tteun-geu-muhp-sseul- -guh-yae-yoh
뜬금없을 겁니다
tteun-geu-muhp-sseul- -guhm-nee-dah

Other useful forms

Command Polite (세요)
뜬금없으세요
tteun-geu-muhp-sseu-sae-yoh
Suggestion / Let's Polite (요)
뜬금없어요
tteun-geu-muhp-ssuh-yoh
Question Polite (요)
뜬금없어요?
tteun-geu-muhp-ssuh-yoh-?
Connective “and” — (고)
뜬금없고
tteun-geu-muhp-goh
Conditional “if” — (면)
뜬금없으면
tteun-geu-muhp-sseu-myuhn
Noun form — (기)
뜬금없음
tteun-geu-muhp-sseum