Verbseoul.
하다 verb (adj)
거대하다geodaehadahuge

To say huge politely in the present tense, use 거대해요 (guh-dae-hae-yoh). Below is the full conjugation of 거대하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
거대해
guh-dae-hae
거대해요
guh-dae-hae-yoh
거대합니다
guh-dae-hahm-nee-dah
Past
거대했어
guh-dae-hae-ssuh
거대했어요
guh-dae-hae-ssuh-yoh
거대했습니다
guh-dae-hae-sseum-nee-dah
Future
거대할 거야
guh-dae-hahl- -guh-yah
거대할 거예요
guh-dae-hahl- -guh-yae-yoh
거대할 겁니다
guh-dae-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
거대하세요
guh-dae-hah-sae-yoh
Suggestion / Let's Polite (요)
거대해요
guh-dae-hae-yoh
Question Polite (요)
거대해요?
guh-dae-hae-yoh-?
Connective “and” — (고)
거대하고
guh-dae-hah-goh
Conditional “if” — (면)
거대하면
guh-dae-hah-myuhn
Noun form — (기)
거대함
guh-dae-hahm