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private
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quiet
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secret
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skryty, tajemniczy
Tom is a very secret person, I don't know anything about him.
She never talks about herself, I don't know if she's so secret or just shy.
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mysterious
He never talks about himself - he's so mysterious.
Don't be so mysterious, tell me about your life.
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reserved
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secretive
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inward
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uptight
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closet
,
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withdrawn