You are inconsistent and unpredictable.

你反复无常，让人捉摸不透。

《柯林斯英汉双解大词典》

The next decade will be even more amazing and unpredictable than the last.

下一个十年将会比上一个更加令人惊奇和不可预测。

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Volatile markets can react suddenly in wild and unpredictable ways.

VOA: special.2011.08.12

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。

利用大众交通工具吧 - SpeakingMax英语口语达人

And blackmail usually works better when the practitioners are seen as irrational and unpredictable.

FORBES: Thoughts On North Korea--Or: How I Learned To Stop Worrying and Love the Hwasong-5/6 Missile

But the law is, at best, a blunt and unpredictable instrument for disciplining bosses.

ECONOMIST: Shareholder activism

We live and lead in a world of imperfect information, guaranteed surprises, and unpredictable occurrences.

FORBES: Three Steps to Handling the Unexpected