variable

[1]	variable quantity
[2]	variable star

adj.

[1]	changeable , protean , changing , inconstant , varying , wavering , mercurial , fickle , capricious , unsteady , unfixed , unstable , uncertain , undependable , unpredictable , fluctuating , vacillating , mutable , chameleonic , chameleon-like
[2]	varying