the quality something has when it is impossible to know in advance that it will happen or what it will be like the unpredictability of the English weather 英国天气的变幻莫测
the quality somebody has when you cannot predict how they will behave in a particular situation （人）善变的，难以捉摸的 His logical good sense complemented her unpredictability. 他逻辑上的好感补充了她的不可预测性。
opposite predictability