quieter , quietest
Someone or something that is quiet makes only a small amount of noise.
Tania kept the children reasonably quiet and contented.
塔妮娅把孩子们哄得安安静静而又心满意足。
If a place is quiet, there is very little noise there.
She was received in a small, quiet office.
她在一间安静的小办公室里受到接见。
If a place, situation, or time is quiet, there is no excitement, activity, or trouble.
a quiet rural backwater.
一个清静的乡间隐蔽处。
If you are quiet, you are not saying anything.
I told them to be quiet and go to sleep.
我叫他们不要说话,去睡觉。
A quiet person behaves in a calm way and is not easily made angry or upset.
placid
He's a nice quiet man.
他是个冷静的好男人。
Quiet is silence.
He called for quiet and announced that the next song was in our honour.
他要求我们安静下来,并宣布下一首歌是献给我们的。
keep quiet about something , keep something quiet
If you keep quiet about something or keep something quiet, you do not say anything about it.
I told her to keep quiet about it.
我叫她对此保守秘密。
on the quiet
If something is done on the quiet, it is done secretly or in such a way that people do not notice it.
She'd promised to give him driving lessons, on the quiet, when no one could see.
她答应在无人看见时秘密地给他上驾驶课。