아깝다

Meanings

regrettableA little sad because one has lost something valuable.
precious; valuableNot wanting to give up something or give it to someone because it is important.
regrettableDeplorable because something is not fully used.

Examples from Lessons (3)

식재료를 버리는 건 너무 아깝잖아.
It's such a waste to throw away ingredients.
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내 가 어제 드라마 보느라 투자한 3 시간 어치 시간 과 에너지 가 하나 도 아깝지 않았어.
The three hours of time and energy I invested into watching the drama last night were worth every bit.
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이렇게 예쁜 카페 에 와서 분위기 도 안 즐기고 공부 만 하다니, 정말 아까운 거 아니야?
Coming to such a pretty cafe and just studying without even enjoying the atmosphere—isn't that such a waste?
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Grammar in These Examples

-ㄴ/은Level 1Adjective noun modifier -(으)ㄴ 것Level 3Past tense noun modifier -지Level 1Sentence ending -잖아Level 3You know, ... right?