volatile
adj 1: (chemistry) evaporating readily at normal temperatures and
pressures; "volatile oils"; "volatile solvents" [ant:
{nonvolatile}]
2: liable to lead to sudden change or violence; "an explosive
issue"; "a volatile situation with troops and rioters
eager for a confrontation" [syn: {explosive}]
3: marked by erratic changeableness in affections or
attachments; "fickle friends"; "a flirt's volatile
affections" [syn: {fickle}]
4: tending to vary often or widely; "volatile stocks";
"volatile emotions"
n : a volatile substance; a substance that changes readily from
solid or liquid to a vapor; "it was heated to evaporate
the volatiles"