모질어요 · 모질었어요 · 모진 (+noun) (ㄹ drops)
harsh, cruel, cold-hearted; tough, resilient
Example
그렇게 모진 말을 하면 친구가 상처받아요.
If you say such harsh words, your friend will get hurt.
Good to know
모질게 마음먹다 'to steel yourself' shows the positive, tough side of the word.
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