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몰랐구나

didn't know, hadn't realized

→ 모르다
몰랐 Past tense + 구나 Exclamatory realization
verb · informal, past tense Rare #21,245
didn't know, hadn't realized A conversational, informal-sounding realization or acknowledgment.
KO: 아, 너는 그걸 몰랐구나.
EN: Oh, you didn't know that.
Conjugation of 모르다
Optative past
몰랐구나

아는 줄 알았는데, 몰랐구나?

I thought you knew, but you didn't?

— Wonderland (2024)

몰랐구나

Oh, you didn't know.

— 400번의 구타 (1959)

아, 복순 씨 몰랐구나?

Oh, you didn’t know, Bok-sun?

— Kill Boksoon (2023)

몰랐구나,

Oh, you didn’t know.

— 홍등 (1991)