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What do you call a person who is unwilling to share information?

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Unwilling to share what kind of information? With whom? Under which circumstances? For what reasons? You have to be more precise, otherwise you'll get a dozen answers that are all equally right, and all equally wrong. –  RegDwigнt Jan 19 '12 at 10:44
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closed as not a real question by RegDwigнt Jan 19 '12 at 10:44

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5 Answers

One possibility is to use:

reticent (n.): not willing to provide information about something, especially about yourself or your feelings.

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In addition to Mehper's answer, I'd suggest discreet might be a good word, if you mean this in the approving sense, or close (meaning 18: Secretive; reticent: "was close about her personal life" ) otherwise. Secretive might also apply in extreme cases.

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I would use secretive.

Secretive: inclined to secrecy or reticence about divulging information.

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I would submit: Paranoid.

Use with caution.

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If it is about private information, the person could be said to be privacy aware.

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