S: (adj) volatile (evaporating readily at normal temperatures and pressures) "volatile oils"; "volatile solvents"
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) impermanent, temporary (not permanent; not lasting) "politics is an impermanent factor of life"- James Thurber; "impermanent palm cottages"; "a temperary arrangement"; "temporary housing"
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
S: (adj) unsteady (subject to change or variation) "her unsteady walk"; "his hand was unsteady as he poured the wine"; "an unsteady voice"
W: (adj) stable [Opposed to: unstable] (resistant to change of position or condition) "a stable ladder"; "a stable peace"; "a stable relationship"; "stable prices"