quietude 静
the state of being quiet; tranquillity; calmness; stillness; quiet
n. 寂静; 平静; 镇静; 沉着

inquietude
A state of restlessness or uneasiness; disquietude
n. 不安；焦虑

quietus
Something that serves to suppress, check, or eliminate.
Release from life; death.
A final discharge, as of a duty or debt.
n. 生命的终止；寂灭；解除；偿清

quiescence
the quality or state of being quiescent
n. 静止；沉默

disquiet
To deprive of peace or rest; trouble.
Absence of peace or rest; anxiety.
lack of calm, peace, or ease; anxiety; uneasiness.
vt. 使不安；使担心，使忧虑
n. 担心，不安；焦虑，忧虑

例句：
The President's speech caused considerable disquiet in some European capitals.
总统的演说在一些欧洲国家首都引起很大不安。

acquiesce ac- = ad-, to qui-quiet coalesce
To consent or comply passively or without protest.
vi. 默许；勉强同意

例句：
After a lot of persuasion,he finally acquiesced.
经过多次劝说，他最终默许了。

acquiescence
Passive assent or agreement without protest.
The state of being acquiescent.
n. 默许；默从

acquiescent
Disposed or willing to acquiesce.
adj. 默认的；默许的；甘心接受的

例句：
Far from being unctuous, Pat was always loath to appear acquiescent.
由于并不愿意假意奉承，所以帕特总是不愿意表现出勉强顺从的姿态。