small uncontrolled movements caused by someone being weak, ill, nervous, etc.

The shakiness in his hands means he needs extra time to get dressed. 他颤抖的双手意味着他需要额外的时间来穿衣服。

Her voice was a little too loud - an attempt to cover her shakiness. 她的声音有点太大了——这是在试图掩盖她的颤抖。

small movements from side to side because something is not being held firmly

I was worried by the shakiness of the bridge. 桥的晃动让我很担心。

the fact of seeming weak or likely to fail

Government bonds gained popularity due to the shakiness of the US stock market. 由于美国股市的波动，政府债券受到欢迎。

Given the shakiness of its central claim, the book is an unsatisfying read. 鉴于其核心主张的摇摆不定，这本书的内容并不令人满意。