Verbseoul.
하다 verb (adj)
침착하다chimchakhadacalm, composed

To say calm, composed politely in the present tense, use 침착해요 (cheem-chah-kae-yoh). Below is the full conjugation of 침착하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
침착해
cheem-chah-kae
침착해요
cheem-chah-kae-yoh
침착합니다
cheem-chah-kahm-nee-dah
Past
침착했어
cheem-chah-kae-ssuh
침착했어요
cheem-chah-kae-ssuh-yoh
침착했습니다
cheem-chah-kae-sseum-nee-dah
Future
침착할 거야
cheem-chah-kahl- -guh-yah
침착할 거예요
cheem-chah-kahl- -guh-yae-yoh
침착할 겁니다
cheem-chah-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
침착하세요
cheem-chah-kah-sae-yoh
Suggestion / Let's Polite (요)
침착해요
cheem-chah-kae-yoh
Question Polite (요)
침착해요?
cheem-chah-kae-yoh-?
Connective “and” — (고)
침착하고
cheem-chah-kah-goh
Conditional “if” — (면)
침착하면
cheem-chah-kah-myuhn
Noun form — (기)
침착함
cheem-chah-kahm