vagary
/ˈveɪgərɪ/noun
(pl. -ies)(一般作vagaries)
- an unexpected and inexplicable change in a situation or in someone's behaviour难以预料的变化, 无法解释的变化：
the vagaries of the weather.
天气的变幻无常。
词源
late 16th cent. （also as a verb in the sense 'roam'）： from Latin vagari 'wander'.