How offensive is the word 바보?
How offensive is the word 바보? Can I call my friends 바보 in a joking manner?

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It can be used to show an Intimacy. The actual meaning is fool, but it can imply cute.

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I love that word. it is sweet as well we usually use that word to people whom we like. I use that word to my sister, my brother and my boyfriend lol

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Of course you can, my friends call me that at times!

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바보(a fool) sounds standard, vintage, childish, literature, naive, etc.
It is not that much offensive.

An offensive word would be 병신(a lame).