rahen

If you want to tell someone to keep quite in a polite manner, it is imperative to add kripya in the beginning. Otherwise, you may like to remove the same.

You have also made a mention about authority in your query. If you want to say so in a authoritative manner, you may use:

Shor mat machaa

If you want to be more authoritative, you may say:

Bakbak mat kar (But be careful, it could sound offensive)

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Note added at 2004-03-29 16:52:51 (GMT)
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Unfortunately, the above explanation contains some errors.

Please read \"quiet\" instead of \"quite\".

Please read \"in an authoritative manner\" in place of \"in a authoritative manner\"



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Note added at 2004-03-30 12:03:09 (GMT)
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Reference:Your addendum above

In view of the context supplied by you, I think that it would be better to ignore \'please\' here as it would feel rather awkward and superfluous in Hindi. You may simply translate it as:

Khaamosh raho

Or

Chup raho

Hero and heroine of a play are supposed be very close and intimate and I think there is no need to include the word \'please\' which would look very formal while translated into Hindi as kripya. Instead, you may consider translating it as:

Chup raho naa

This implies an informal request as well.

Hope this helps.