adjective
quieter; -est
[also more ~; most ~]
making very little noise
not talking
tending not to talk very much
not having much activity or movement
not disturbed by noise or people
not shown or done in an obvious way
keep quiet
to not say anything or make any noise
keep quiet about (something) or keep (something) quiet :to not say anything about (something)
keep (someone) quiet
to prevent (someone) from speaking or to prevent (someone or something) from making noise
to prevent (someone) from revealing information about something
verb
-ets; -eted; -eting
[+ obj] chiefly US :to make (someone or something) quieter, calmer, or less intense
quiet down
[phrasal verb] chiefly US :to become quiet or quieter :to become calmer or less noisy
noun
[noncount] :the quality or state of being quiet or calm
on the quiet
in a secret or quiet way :without people knowing