W: (n) volatile [Related to: volatile] (a volatile substance; a substance that changes readily from solid or liquid to a vapor) "it was heated to evaporate the volatiles"
W: (n) volatility [Related to: volatile] (the property of changing readily from a solid or liquid to a vapor)
S: (adj) explosive, volatile (liable to lead to sudden change or violence) "an explosive issue"; "a volatile situation with troops and rioters eager for a confrontation"
S: (adj) unstable (lacking stability or fixity or firmness) "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy"
S: (adj) changeable, changeful (such that alteration is possible; having a marked tendency to change) "changeable behavior"; "changeable moods"; "changeable prices"