vagary

NUDGE by R. H.Thaler and C. R. SusteinのPrivatising Marriageの章に出てきた "vagary" は一年程前に取り上げていましたが、忘れていたので再度取り上げます。　
Also, it is sophisticated and wealthy couples who are most likely to enter into prenuptial agreements, to understand the law, and to obtain high-quality legal representation in the event of divorce. The result of all this is to leave most people vulnerable to the vagaries of chance--and to a legal system that has an astonishing degree of uncertainty.
今回は前回とは異なる辞書の意味を引用します。
・Vocabulary.com: an unexpected and inexplicable change in something (in a situation or a person's behavior, etc.): “the vagaries of the weather”; “his wealth fluctuates with the vagaries of the stock market”
Vocabulary.com:は更に詳しい説明が付いています。
＊A vagary is an unexpected and unpredictable change, and the word is usually used in the plural. You might know from experience that the vagaries of winter weather make planning a vacation in February a risky proposition.
＊Vagary traces back to the Latin root meaning "wander," and you can think of a vagary as something that wanders. Events or situations that seem to change at random have vagaries. Whether the hottest new boy band will succeed or not is dependent on the vagaries of teenage enthusiasms. The vagaries of the real estate market will determine whether that swamp property you just bought is a gold mine or a disaster.
"vagary" だけで覚えようとしても忘れそうなので、"the vagaries of the weather" あるいは "the vagaries of the stock market" で覚えた方が良さそうです。