名词无把握，不确定; 不可靠; 不确实知道，半信半疑; 无把握、不确定的事物

名词

1. Do what you can and don't worry about uncertainties.
尽力做你所能做的事情，不要为难以预料的事物而烦恼。

2. John was depressed by the uncertainty of his position and duty.
不确定的职位和职能使约翰感到沮丧。

1. 不定性：风险(risk)和不定性(uncertainty)现象无处不在,在日常生活中对两者没有特别的区分,但在经济学上两者存在一定差异. 奈特(1921)最早对风险和不确定性进行了区分,认为如果经济单位对所面临的事件的结果不能够以具体概率值表示,

1. 不确定；犹疑
Uncertainty is a state of doubt about the future or about what is the right thing to do.

e.g. ...a period of political uncertainty.
政治动荡的一段时期
e.g. ...the uncertainties of life on the West Coast.
西海岸生活的迷茫

noun

1. being unsettled or in doubt or dependent on chance

e.g. the uncertainty of the outcome
the precariousness of his income

Synonym: uncertainnessprecariousness

2. the state of being unsure of something

Synonym: doubtincertitudedubietydoubtfulnessdubiousness