Verbseoul.
하다 verb (adj)
적당하다jeokdanghadato be fit, suitable, adequate

To say to be fit, suitable, adequate politely in the present tense, use 적당해요 (chuhg-dahng-hae-yoh). Below is the full conjugation of 적당하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
적당해
chuhg-dahng-hae
적당해요
chuhg-dahng-hae-yoh
적당합니다
chuhg-dahng-hahm-nee-dah
Past
적당했어
chuhg-dahng-hae-ssuh
적당했어요
chuhg-dahng-hae-ssuh-yoh
적당했습니다
chuhg-dahng-hae-sseum-nee-dah
Future
적당할 거야
chuhg-dahng-hahl- -guh-yah
적당할 거예요
chuhg-dahng-hahl- -guh-yae-yoh
적당할 겁니다
chuhg-dahng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
적당하세요
chuhg-dahng-hah-sae-yoh
Suggestion / Let's Polite (요)
적당해요
chuhg-dahng-hae-yoh
Question Polite (요)
적당해요?
chuhg-dahng-hae-yoh-?
Connective “and” — (고)
적당하고
chuhg-dahng-hah-goh
Conditional “if” — (면)
적당하면
chuhg-dahng-hah-myuhn
Noun form — (기)
적당함
chuhg-dahng-hahm