vagaries
noun /ˈveɪɡəriz/
  /ˈveɪɡəriz/
[plural] (formal)- changes in somebody/something that are difficult to predict or control
- All farmers are exposed to the vagaries of the weather.
 - Their wealth fluctuates with the vagaries of the stock market.
 
Word Originlate 16th cent. (also as a verb in the sense ‘roam’): from Latin vagari ‘wander’.