What does "괜시리" mean?
I noticed it in songs like "물고기", "애인이 돼 주길 바래요", and "Love Light". I've looked it up in dictionaries, but there is no definition available. I'd really appreciate your assistance ^^

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It should be "괜스레", but "괜시리" is also often used as well.
It can mean "without any reason, somehow"

\^o^/

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괜시리 (non-standard word. But some Koreans use it)
= 괜히
= in vain; unnecessarily.