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English definition of “volatile”

volatile

adjective uk   /ˈvɒl.ə.taɪl/ us    /ˈvɑː.lə.t̬əl/
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. A volatile liquid or solid substance will change easily into a gas.
volatility
noun [U] uk   /ˌvɒl.əˈtɪl.ɪ.ti/ us    /ˌvɑː.ləˈtɪl.ə.t̬i/
(Definition of volatile from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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