Verbseoul.
하다 verb (adj)
미흡하다miheuphadato be unsatisfactory, to be inadequate

To say to be unsatisfactory, to be inadequate politely in the present tense, use 미흡해요 (mee-heu-pae-yoh). Below is the full conjugation of 미흡하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
미흡해
mee-heu-pae
미흡해요
mee-heu-pae-yoh
미흡합니다
mee-heu-pahm-nee-dah
Past
미흡했어
mee-heu-pae-ssuh
미흡했어요
mee-heu-pae-ssuh-yoh
미흡했습니다
mee-heu-pae-sseum-nee-dah
Future
미흡할 거야
mee-heu-pahl- -guh-yah
미흡할 거예요
mee-heu-pahl- -guh-yae-yoh
미흡할 겁니다
mee-heu-pahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
미흡하세요
mee-heu-pah-sae-yoh
Suggestion / Let's Polite (요)
미흡해요
mee-heu-pae-yoh
Question Polite (요)
미흡해요?
mee-heu-pae-yoh-?
Connective “and” — (고)
미흡하고
mee-heu-pah-goh
Conditional “if” — (면)
미흡하면
mee-heu-pah-myuhn
Noun form — (기)
미흡함
mee-heu-pahm