unpredictably
🇺🇸
/ˌʌnprɪˈdɪktəbli/
🇬🇧
/ˌʌnprɪˈdɪktəbli/
in a way that is hard to guess or know in advance
The weather changed unpredictably, causing delays in our travel plans.
天气变化莫测,导致我们的旅行计划延误。