渺茫的英文：
uncertain
remote
distant and indistinct
vague

参考例句：

What you said is only pie in the sky.
你所说的实在是渺茫得很。

There's an outside chance we'll get the contract after all.
说到底我们得到那份合同的希望极其渺茫。

to be at the nadir of his hope
他的希望极其渺茫。

Their chance of winning are slim.
他们取胜的机会很渺茫。

The road ahead is murky indeed.
前路的确渺茫。

at the nadir of one's hope
希望极为渺茫

A slender chance of survival.
渺茫的生存机会

slender wages;a slender chance of survival.
微薄的薪水;渺茫的生存机会

The goal of an insect-free world continued to recede.
实现无昆虫这一目标越来越渺茫。

Hope of finding the lost plane began to ebb.
找到迷失飞机的希望已很渺茫。

uncertain是什么意思：
adj. 不确定的，无常的

Were they uncertain of what to say?
他们不确定要说些什么吗？

to believe especially on uncertain or tentative grounds.
在一个不确定的假设性的基础上提出的假设。

The cause remains uncertain and treatment unsatisfactory.
病因不详，还未找到有效的治疗方法。

remote是什么意思：
adj. 遥远的；偏僻的；疏远的
n. 远程

outside chance; remote possibility.
不大可能的机会；极小的可能性。

remote transfer system
遥距转运系统

The connection to the remote computer was broken.
跟远程计算机的连接被打断。

distant是什么意思：
adj. 远隔的，遥远的；远房的；不太热情的；出神的

There is no distant transmitter to telecast the scene.
没有远距离发射机传送景象。

Her manner was cold and distant.
她的态度冷漠而疏远。

A ripple reaches the distant bank.
一个涟漪到达了彼岸。