vagary /ˈvāɡərē, ˈveɪɡəri 
/ ▸ noun (plural vagaries)
(usually vagaries) an unexpected and inexplicable change in a situation or in someone's behavior: the vagaries of the weather.
– ORIGIN late 16th century (also as a verb in the sense ‘roam’): from Latin vagari ‘wander’.
EnglishOxford New American Dictionary
