How do you describe people who are low-pitched?

[Maggie]

Hi,guys

How do you describe people who are low-pitched? For example,some celebrities don't want to let others know how rich they are,their private things etc. Please give me other adjectives.

ex. John is always very low-pitched,and he never accepts any interviews of reporters.

Actually,I am not sure if I could use 'low-pitched' here. Could you tell me do you use this term?

Thank you very much.


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[Mister Micawber]

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I don't know what 'low-pitched' means, except in the case of sousaphones. A few possibilities:

John is always very unapproachable / close-mouthed / reclusive / publicity-shy / is a very private person, and he never accepts interviews by reporters.
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