Verbseoul.
하다 verb (adj)
심심하다simsimhadabored, boring

To say bored, boring politely in the present tense, use 심심해요 (sheem-sheem-hae-yoh). Below is the full conjugation of 심심하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
심심해
sheem-sheem-hae
심심해요
sheem-sheem-hae-yoh
심심합니다
sheem-sheem-hahm-nee-dah
Past
심심했어
sheem-sheem-hae-ssuh
심심했어요
sheem-sheem-hae-ssuh-yoh
심심했습니다
sheem-sheem-hae-sseum-nee-dah
Future
심심할 거야
sheem-sheem-hahl- -guh-yah
심심할 거예요
sheem-sheem-hahl- -guh-yae-yoh
심심할 겁니다
sheem-sheem-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
심심하세요
sheem-sheem-hah-sae-yoh
Suggestion / Let's Polite (요)
심심해요
sheem-sheem-hae-yoh
Question Polite (요)
심심해요?
sheem-sheem-hae-yoh-?
Connective “and” — (고)
심심하고
sheem-sheem-hah-goh
Conditional “if” — (면)
심심하면
sheem-sheem-hah-myuhn
Noun form — (기)
심심함
sheem-sheem-hahm