volatile
/ˈvɔlətaɪl; ?@ -tl; `vɑlətl/ adj
1 (of a liquid) changing rapidly into vapour （指液体）易挥发的.
2 (espderog 尤作贬义) (of a person) changing quickly from one mood or interest to another; fickle （指人）情绪或兴趣多变的, 无常性的
a highly volatile personality, disposition,nature, etc 反覆无常的个性、 性情、 天性等.
3 (of trading conditions, etc) likely to change suddenly or sharply; unstable （指商情等）很可能急剧波动的, 不稳定的
volatile stock-markets, exchange rates 不稳定的股市、 汇率
a volatile political situation, eg one that could lead to a change of government 动荡不定的政局.