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.
如果沒有麪麪俱到的信息來描述軟件的工作方式，那麽用戶就會覺得它的行爲是不可預知的。
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.
如果您有重複的 ID 屬性，那麽結果是不可預知的，但是，通常這不是您希望的結果，竝且問題非常難以確定。
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，您可以容易地結束這樣一種情形，即調用的兩邊的類都隱式地假設它們擁有數組，衹是這樣會有不可預知的結果出現。

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，上帝的承諾是確定無疑的，但實現的方法和時機卻都是不可知的。
耶魯公開課 - 舊約導論課程節選
Yeah, driving in LA, it's really unpredictable and can be dangerous.
是的，在洛杉磯開車，真的沒法預測，可能很危險。
利用大衆交通工具吧 - SpeakingMax英語口語達人

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