what is慚愧?

shame (GUILT)
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noun [U]
an uncomfortable feeling of guilt or of being ashamed because of your own or someone else's bad behavior
He pointed out that society needed to restore a sense of shame about certain things.

If you say shame on you to someone, usually a child, you are saying that they should feel ashamed because of something they have done.

shame
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verb [T]
My aunt told us that in her day women who weren't married by the age of 25 were considered "old maids" and were so shamed by their families that they would do anything to get married.

shameful
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adjective
causing you to feel guilty or ashamed, or being a cause for feeling ashamed
It's shameful that his own country did not fully appreciate his talent until it was recognized abroad.