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) inconstant (likely to change frequently often without apparent or cogent reason; variable) "inconstant affections"; "an inconstant lover"; "swear not by...the inconstant moon"- Shakespeare