if a situation, an event, a price, etc. is unpredictable you cannot be sure what will happen because it changes a lot or depends on too many different things不可预知的；无法预言的；不稳定的◆the unpredictable nature of oil prices石油价格的不稳定性➡predictable ▸unpredictability /ˌʌnprɪˌdɪktəˈbɪləti/