Verbseoul.
하다 verb (adj)
뜸하다tteumhadato be rarely or seldom happening (these days)

To say to be rarely or seldom happening (these days) politely in the present tense, use 뜸해요 (tteum-hae-yoh). Below is the full conjugation of 뜸하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
뜸해
tteum-hae
뜸해요
tteum-hae-yoh
뜸합니다
tteum-hahm-nee-dah
Past
뜸했어
tteum-hae-ssuh
뜸했어요
tteum-hae-ssuh-yoh
뜸했습니다
tteum-hae-sseum-nee-dah
Future
뜸할 거야
tteum-hahl- -guh-yah
뜸할 거예요
tteum-hahl- -guh-yae-yoh
뜸할 겁니다
tteum-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
뜸하세요
tteum-hah-sae-yoh
Suggestion / Let's Polite (요)
뜸해요
tteum-hae-yoh
Question Polite (요)
뜸해요?
tteum-hae-yoh-?
Connective “and” — (고)
뜸하고
tteum-hah-goh
Conditional “if” — (면)
뜸하면
tteum-hah-myuhn
Noun form — (기)
뜸함
tteum-hahm