忐忑不安的英文：
[Literal Meaning]
uneasy/not/settle
to become worried and not at ease

[解释]
忐忑：心神不安定。形容害怕而心里不安，对事情没有把握。

[Explanation]
to become very much worried or upset

[例子]
在听校长宣布今年的优秀毕业生时，他心里忐忑不安。

[Example]
When hearing the headmaster would announce the excellent students this year, he was very upset in his heart.

[英文等价词]
to fret and fume
in fear and trembling

He was the more affable on the surface as secretly he became more apprehensive, felt more hollow
他表面上越是和蔼可亲，内心越是忐忑不安，越感到空虚。

He felt a worm of unease.
他感到一阵忐忑不安。

The students are on a knife-edge about the examinations.
学生们对考试感到忐忑不安。

News of the earthquake discomforted us.
地震的消息使我们感到忐忑不安。

He could not ease his disquiet.
他无法缓解忐忑不安的心绪。

I don't know why I'm having a case of the jitters these days
不知为什么这几天我总感到忐忑不安

She was keyed up over her impending operation
她为了将进行的手术而心中忐忑不安。

She was keyed up over her impending operation.
她为了将进行的手术而心中忐忑不安。

As the day approached, he felt himself growing restless and uneasy.
日子越来越近,他觉得自己忐忑不安起来。

Many of us have had a case of the jitters since that family moved in here.
自从那家人搬到我们这儿,我们就感到忐忑不安。