›likely to change suddenly and unexpectedly or suddenly become violent or angry: Food and fuel prices are very volatile in a war situation.The situation was made more volatile by the fact that people had been drinking a lot of alcohol.He had a rather volatile temper and can't have been easy to live with.Changing frequentlyChangingAngry and displeasedBad-tempered›A volatile liquid or solid substance will change easily into a gas.The state of mattervolatility