THUNDERSTORMS are notoriously unpredictable, as many a drenched picnicker can attest.

雷暴难以预测，对此那些被淋得透湿野餐者深有体会。

His actions since that morning have been eccentric and unpredictable.

自从那天早晨,他行动一直是常而不可捉摸。

Andrew describes him as respected and authoritative in the outside world but passive, unpredictable and rageful at home.

根据他描述，父亲在外界是位受人尊重权人士，但是在家里却消极被动，情绪多变，甚至时常暴怒。

He makes unpredictable,arbitrary decisions.

他做决难以预料,主观武断。

In dealing with that unpredictable man, you simply cannot follow a prearranged plan, you have to play it by ear.

和那个捉摸不人打交道, 你简直法按预计划行事, 只好随机应变。

Klaus, however, is seen as a maverick, notoriously unpredictable, implacably opposed to the treaty, and liable to spring further surprises.

然而，克劳斯被认为是一个恶名昭彰对党，毫不妥协地对里斯本条约，很有可能又会有惊人之举。