volatile
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(a) evaporating readily at normal temperatures and pressures
- volatile oils
- volatile solvents
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(s) liable to lead to sudden change or violence
- an explosive issue
- a volatile situation with troops and rioters eager for a confrontation
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(s) marked by erratic changeableness in affections or attachments
- fickle friends
- a flirt's volatile affections
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(s) tending to vary often or widely
- volatile stocks
- volatile emotions
Nouns
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(n) a volatile substance; a substance that changes readily from solid or liquid to a vapor
- it was heated to evaporate the volatiles