유익해요 · 유익했어요 · 유익한 (+noun)
useful, beneficial, informative
Example
오늘 들은 강의는 정말 재미있고 유익했어요.
The lecture I heard today was really fun and informative.
Word parts
유 have+익 gain
Literally 'having gain'.
Good to know
Pronounced [유이카다]; 유익한 시간 (a worthwhile time) is a common polite compliment.
Related words