changeable
adj
1 tending to change; often changing 易变的; 常变的
a changeable person, mood 喜怒无常的人、 情绪
changeable weather 多变的天气.
2 that can be changed 能被改变的.
Whenever the Italian city-states were at war with each other, Hawkwood used to hire his soldiers to princes who were willing to pay the high price he demanded.