fickle

她的品味变化无常，上个月还喜欢古典音乐，现在却迷上了摇滚。

Her ___fickle tastes changed from classical music last month to rock music now.

山区天气变化无常，一小时之内从明媚阳光转为冰雹来袭，迫使登山者匆忙寻找遮蔽处。

The ___fickle mountain weather turned from bright sunshine to a hailstorm within the hour, forcing the hikers to scramble for shelter.

时尚评论家指出消费者变得何其善变，上个月人手一双的爆款运动鞋如今已滞留在清仓货架上。

Fashion critics noted how ___fickle consumers had become, with last month's must-have sneaker already languishing on clearance racks.