Can you be quiet, please?
Our new dishwasher is very quiet.
It's so quiet without the kids here.
She spoke in a quiet voice so she wouldn't wake the baby.
But now everything must change - after 10 pm [we] must be quiet. (Preliminary English Test; B1; Polish)
a quiet town/neighborhood
It was a quiet wedding, with just a few friends and relatives.
I'd like to spend a quiet night at home.
My house is near the hospital and it is in a very quiet area. (Key English Test; A2; Italian)
He was a shy, quiet man.
I was a bit worried about her - she seemed very quiet.
He's a quiet person but I'm [that] too. (Preliminary English Test; B1; Swiss German)
It might be wise to keep this quiet for a while.
They tried to keep it quiet but, somehow, half the village knew about the news in a few days. (Certificate of Proficiency in English; C2; Spanish)
She needs a some peace and quiet.
At least if you were working in a museum, you would probably have some peace and quiet. (First Certificate in English; B2; Greek)