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"
W: (adj) unchangeable [Indirect via changeable] (not changeable or subject to change) "a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life"