Volatile (adjective) UK /ˈvɒl.ə.taɪl/ US /ˈvɑː.lə.t̬əl/
Likely to change suddenly and unexpectedly, especially by getting worse.
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.
“Volatility” is the noun form.