WordNet sense 1 (subject to change):

uncertain, unsettled

WordNet sense 2 (liable to or capable of change):

variable

WordNet sense 3 (varying in color when seen in different lights or from different angles):

chatoyant, iridescent, shot

WordNet sense 4 (having striking color):

colorful, colourful

WordNet sense 5 (capable of or tending to change in form or quality or nature):

mutable

WordNet sense 6 (tending to vary often or widely):

volatile

WordNet sense 7 (capable of changing quickly from one state or condition to another):

mobile, mobile

WordNet sense 8 (continually shifting or rapidly changing):

kaleidoscopic

WordNet sense 9 (affording change (especially in social status)):

fluid

WordNet sense 10 (subject to change; variable):

unstable

WordNet sense 11 (liable to sudden unpredictable change):

erratic, fickle, mercurial

WordNet sense 12 (such that alteration is possible; having a marked tendency to change):

changeful