From The Collaborative International Dictionary of English v.0.48:
Changeable \Change"a*ble\, a. [Cf. F. changeable.]
1. Capable of change; subject to alteration; mutable;
variable; fickle; inconstant; as, a changeable humor.
[1913 Webster]
2. Appearing different, as in color, in different lights, or
under different circumstances; as, changeable silk.
Syn: Mutable; alterable; variable; inconstant; fitful;
vacillating; capricious; fickle; unstable; unsteady;
unsettled; wavering; erratic; giddy; volatile.
[1913 Webster]