unpredictable

英 [ʌnprɪ'dɪktəb(ə)l] 美[,ʌnprɪ'dɪktəbl]

• adj. 不可预知的；不定的；出乎意料的
• n. 不可预言的事

1. impossible to foretell

2. unknown in advance;

"an unpredictable (or indeterminable) future"

3. not occurring at expected times