that cannot be predicted because it changes a lot or depends on too many different things 无法预言的;不可预测的;难以预料的 The unpredictable weather in the mountains can make climbing extremely hazardous. 山里那变幻莫测的天气可以使登山变得异常危险。 The result is entirely unpredictable. 结果是完全无法预料的。 Role play trains students to deal with the unpredictable nature of language. 角色扮演训练学生应对语言的不可预测性。
if a person is unpredictable, you cannot predict how they will behave in a particular situation (人)善变的,难以捉摸的 Her behaviour became so unpredictable when she had been drinking. 她一酗酒行为就变得不可捉摸。 No-one knows where they stand with him; he is utterly unpredictable. 谁也不知道他怎样看待他们;他是个完全不可捉摸的人。