JLPT N3Idioms

口が堅い

Meaning
秘密をしっかり守って人に話さない
Explanation
「口が堅い」 means to firmly keep a secret and not tell others. Conversely, a person who quickly blabs is called 「口が軽い」. Note that it does not mean a stubborn personality.
Original Japanese explanation

「口が堅い」は、秘密をしっかり守って、ほかの人に話さないという意味です。反対に、すぐ話してしまう人は「口が軽い」と言います。性格が頑固という意味ではないので注意しましょう。

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