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adjective

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volatile - An unstable situation that is likely to get worse quickly

Victor realized that he had created a volatile chemical that could easily explode if he wasn't very careful

noun

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outbreak - A sudden start or increase of something harmful, especially a disease or conflict.

The outbreak of the flu led to school closures across the region.

noun

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casualty - A person killed or injured in a war or accident.

Though many people were injured when the bus crashed, thankfully there were no casualties.