Oxford Advanced American Dictionary

Definition of quiet adjective from the Oxford Advanced Learner's Dictionary

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quiet

adjective
quiet pronunciation English ˈkwaɪət quiet pronunciation American ˈkwaɪət
 
quieter, quietest1 making very little noiseher quiet voicea quieter, more efficient engineCould you keep the kids quiet while I'm on the phone?He went very quiet (= did not say much) so I knew he was upset.‘Be quiet,’ said the teacher.She crept downstairs (as) quiet as a mouse.2 without many people or much noise or activitya quiet streetThey lead a quiet life.Business is usually quieter at this time of year.They had a quiet wedding.The hotel is in a quiet location near the sea.3 not disturbed; peacefulto have a quiet drinkI was looking forward to a quiet evening at home.4 (of a person) tending not to talk very muchShe was quiet and shy.5 (of a feeling or an attitude) definite but not expressed in an obvious wayHe had an air of quiet authority.quietly
quietly pronunciation English ˈkwaɪətli quietly pronunciation American ˈkwaɪətli
adverbto speak/move quietlyI spent a few hours quietly relaxing.He is quietly confident that they can succeed (= he is confident, but he is not talking about it too much).a quietly-spoken woman quietness
quietness pronunciation English ˈkwaɪətnəs quietness pronunciation American ˈkwaɪətnəs
noun [uncountable]the quietness of the countrysideHis quietness worried her.
Idioms

keep quiet about something

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keep something quiet

to say nothing about something; to keep something secret
I've decided to resign but I'd rather you kept quiet about it.This story is too big to be kept quiet.