粋狂 粋狂さ 酔狂 酔狂さ
an unexpected and inexplicable change in something (in a situation or a person's behavior, etc.)
何か（状況または人の振る舞いなど）の思いがけないまた説明がつかない変更
the vagaries of the weather his wealth fluctuates with the vagaries of the stock market he has dealt with human vagaries for many years
気まぐれな天気 彼の富は、株式市場の気まぐれで変動する 彼は、長年人間の気まぐれに対処した