진지해요 · 진지했어요 · 진지한 (+noun)
serious, earnest, sincere
Example
농담 아니에요, 진지하게 하는 말이에요.
I'm not joking; I'm saying this seriously.
Word parts
진 true+지 sincere
Literally 'true and sincere'.
Good to know
Describes attitude, not severity: a 'serious illness' is 심각한 병, not 진지한 병.
Related words