"volatile" in the noun sense
1. volatile
a volatile substance a substance that changes readily from solid or liquid to a vapor
"it was heated to evaporate the volatiles"
"volatile" in the adjective sense
1. volatile
evaporating readily at normal temperatures and pressures
"volatile oils"
"volatile solvents"
2. explosive, volatile
liable to lead to sudden change or violence
"an explosive issue"
"a volatile situation with troops and rioters eager for a confrontation"
3. fickle, volatile
marked by erratic changeableness in affections or attachments
"fickle friends"
"a flirt's volatile affections"
4. volatile
tending to vary often or widely
"volatile stocks"
"volatile emotions"
Source: WordNet® (An amazing lexical database of English)
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