If you are uncertain about something, you do not know what you should do, what is going to happen, or what the truth is about something.
近义词
unsure
双语例句
例：
He was uncertain about his brother's intentions.
他不清楚他兄弟的意图。
例：
They were uncertain of the total value of the transaction.
他们不清楚这笔交易的总额。
2.?未知的 , 不明确的
If something is uncertain, it is not known or definite.
双语例句
例：
How much practical help they can give us is uncertain.
他们能给我们多少实际帮助还是个未知数。
例：
It's uncertain whether they will accept the plan.
还不知道他们是否会接受这项计划。
PHRASE. 习语
in no uncertain terms
1.?非常明确地
If you say that someone tells a person something in no uncertain terms, you are emphasizing that they say it strongly and clearly so that there is no doubt about what they mean.