Vagaries are unexpected and unpredictable changes in a situation or in someone's behaviour which you have no control over.
例句
I take an assortment of clothes on holiday, as a provision against the vagaries of the weather.我帶了各種衣服去度假，以防天氣突變。...the perplexing vagaries of politics.復雜難解、變幻莫測的政壇風云
英漢詞典釋義
n.
異常行為;難以預測的情況
The style of vagary and ghastfulness and the sense of mystery are full of thestory of Allan.愛倫的小說風格奇特恐怖,充滿了神秘感。
英英詞典釋義
Noun
1. 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""he has dealt with human vagaries for many years"