정말 큰

really big

→ 정말
phrase Uncommon #14,322
really big 정말 means “really,” and 큰 is the form of 크다 (“to be big”) used before a noun.
KO: 정말 큰 집이에요.
EN: It's a really big house.

정말 큰 문제 야

It's a really big problem.

— 아메리칸 갱스터 (2007)

오, 당신 정말 큰 실수하는 거 야

Oh, you’re making a really big mistake.

— 헌팅시즌 (2025)