not to know good from bad ; not to appreciate what is good ; not to know what's good for oneself ; not to know chalk from cheese
让你不知好歹 So you don't know Doss ; Make you ungrateful ; Let you know what's good
You are really an ungrateful wretch to complain instead of thanking him.
你不但不谢他， 还埋怨他， 真不知好歹。
我认为她这是不知好歹。
I thought it was ungrateful of her.
《柯林斯英汉双解大词典》
你真是个不知好歹的孩子，整天游手好闲，一无是处！
What a thankless child you are, just idle and good-for-nothing!
youdao
你不但不谢他，还埋怨他，真不知好歹。
《新英汉大辞典》
不知好歹是一个汉语成语，拼音是bù zhī hǎo dǎi，意思是指不知道是非；不领别人好意。比喻做事情也不掂量一下自己，去惹那些自己惹不起的人。
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