unpredictable

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In absence of comprehensive information on how the software works, the user will have an impression that the its behavior is unpredictable.
如果没有面面俱到的信息来描述软件的工作方式，那么用户就会觉得它的行为是不可预知的。
If you have duplicate ID attributes, then results are unpredictable but generally not what you want, and the problem can be maddening to track down.
如果您有重复的 ID 属性，那么结果是不可预知的，但是，通常这不是您希望的结果，并且问题非常难以确定。
Otherwise, you can easily end up in a situation where the classes on both sides of the call implicitly assume that they own that array, with unpredictable results.
另外，您可以容易地结束这样一种情形，即调用的两边的类都隐式地假设它们拥有数组，只是这样会有不可预知的结果出现。

Volatile markets can react suddenly in wild and unpredictable ways.
The first is, that while God's promise is sure, the manner and the timing of its fulfillment is quite unpredictable.
首先是，上帝的承诺是确定无疑的，但实现的方法和时机却都是不可知的。
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Yeah, driving in LA, it's really unpredictable and can be dangerous.
是的，在洛杉矶开车，真的没法预测，可能很危险。
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Based on its own perceptions, an employee culture rarely does anything illogical or unpredictable.
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likely to change suddenly and without reason and therefore not able to be predicted (= expected before it happens) or depended on

If you describe someone or something as unpredictable, you mean that you cannot tell what they are going to do or how they are going to behave.
unpredictability