VOLATILE

[adjective] - likely to change suddenly and unexpectedly or suddenly become violent or angryFood and fuel prices are very volatile.The volatile ethnic and religious mix in this region has led to a lot of conflict over the years.The situation was made more volatile by the fact that people had been drinking a lot of alcohol.Like many actors, he had a rather volatile temper and can't have been easy to live with.She's a rather volatile tennis player.A liquid or solid substance that is volatile will change easily into a gas.