noun
a substance that is easily vaporized at a relatively low temperature
adjective
liable to change rapidly and unpredictably, especially for the worse
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The stock market is known for being volatile, with prices constantly fluctuating.
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Her mood can be quite volatile, so it's best to approach her with caution.
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The situation at the party got really volatile, so we decided to leave early.
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Their relationship was like a volatile chemical reaction, with sparks flying constantly.