changeable

形容词 changeable:

1. capable of or tending to change in form or quality or nature
   同义词：mutable
2. such that alteration is possible; having a marked tendency to change
   同义词：changeful
3. subject to change
   同义词：uncertain, unsettled
4. varying in color when seen in different lights or from different angles
   同义词：chatoyant, iridescent, shot

1. It's so changeable at this time of year.
   这段时间天气变化无常。
2. His temper's is changeable this week, so do not annoy him.
   这星期他脾气变化无常，所以不要惹他生气。
3. The small city has the climate that is changeable in the extreme.
   这座小城有变化多端的气候。

change.a.ble

adj.（形容词）
Liable to change; capricious:
易变的：很可能变化的；易变的：
例句：
changeable weather.
易变的天气

Being such that alteration is possible:
可改变的：处于可能发生变化的状况下的：
例句：
changeable behavior.
可改变的行为

Varying in color or appearance when seen from different angles:
颜色有变化的：从不同角度看颜色或外表不同的：
例句：
changeable silk.
变色丝绸

【引伸】
change.abil.ity 或
change.ableness
n.（名词）
change.ably
adv.（副词）