He has a glib tongue

He has a glib tongue.

Is it common to use the phrase “glib tongue”?
When someone says someone else has a glib tongue, is it a compliment or the opposite?

Thank you!!!

This is not a common phrase among the people I know. It is more common in written dialogue than everyday speech. The phrase, “you’re so glib” is used sometimes and can be either a compliment or a mild or joking insult. It means that the speaker is nonchalant or does not seem to take things seriously. The phrase “glib tongue” would almost never be said to a person, it is mostly said about another person who is not present.

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No, it is not common to use the phrase “glib tongue”.
It is neither an intrinsic compliment nor insult. It can be positive or negative depending on the context in which it is said.

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