volatile

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vola|tile /v'ɒlətaɪl, AM -təl/
1 [ADJ]
A situation that is volatile is likely to change suddenly and unexpectedly.
The international oil markets have been highly volatile since the early 1970s...
= unstable
● volatility [N-UNCOUNT]
He is keen to see a general reduction in arms sales given the volatility of the region.
= instability
2 [ADJ]
If someone is volatile, their mood often changes quickly.
He has a volatile temper.
3 [ADJ]
A volatile liquid or substance is one that will quickly change into a gas. (TECHNICAL)
It's thought that the blast occurred when volatile chemicals exploded.

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