fickle
🇺🇸
/ˈfɪkl/
🇬🇧
/ˈfɪkl/
changes quickly without warning
It's hard to plan a picnic when the weather is so fickle.
天气如此多变,很难计划野餐。
changes their mind a lot and cannot be trusted
John is quite fickle; he promises to come but often doesn't.
约翰相当善变;他承诺来但经常不来。