N-VAR
一時的興致;心血來潮;突發的奇想
A whim is a wish to do or have something which seems to have no serious reason or purpose behind it, and often occurs suddenly.
例句
We decided, more or less on a whim, to sail to Morocco...
我們多少有點心血來潮，決定航海去摩洛哥。
The premium can increase at the whim of the insurers...
保險公司可以隨時提高保費。