How to understand "คนดี“？
I've found that the word "คนดี“ in some Thai songs,is it just means a nice person? If not,how many different meanings does it have?

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You can call your beloved คนดี
รักนะคะคนดีของฉัน, อย่าดื้อนะคะคนดีของแม่ for example ka haha

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For example: She is bright, friendly, kind, and considerate. 
In brief, she is a "good person (คนดี)".

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"คนดี" in thai songs,Almost meaning is your boy-friend or grail-friend.
Not Good perspn  for all,only for me

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คนดี= 好人

沒有其他意思了

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Yeah.  good person , it's mean "คนดี“ .