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Definition of mutable : 1. Capable of alteration; subject to change; changeable in form, qualities, or nature.
2. Changeable; inconstant; unsettled; unstable; fickle.

Synonyms:

shot, uncertain, iridescent, chatoyant, change, various, variant

inconstant, unsteady, flexible, alterable, restless, adaptable, irresolute, unsettled, vacillating, mercurial, transposable, varying, precarious, modifiable, shifting, convertible, movable, protean, wavering, variable, adjustable, fluid, changeable, reformable, unstable, vicissitudinous, fickle, changeful, volatile, versatile, flighty, transformable, ever-changing

pliable, indecisive, undependable, unreliable, impulsive, permutable, fluctuating, doubtful

flickering, mortal, rootless, ephemeral, instantaneous, transitory, short-term, evanescent, cursory, passing, transient, fading, flitting, brief, fleeting, temporal, short-lived, temporary, momentary, impermanent

lithe, stretchy, buoyant, malleable, plastic, extensible, supple, limber, springy, pliant, resilient, elastic

Usage examples:

• They are mutable, and from them new dialects are produced. - "A Manual of the Antiquity of Man", J. P. MacLean.
• You must read the revolutionary movement of the later nineteenth century, darkened indeed by materialism and made mutable by fear and free thought, but full of awful vistas of an escape from the curse of Adam. - "George Bernard Shaw", Gilbert K. Chesterton.
• Where can we find a basis for faith and morals which shall be simultaneously absolute and mutable; shall be above man, and none the less human; shall be ideal, and none the less real? - "The Forerunners", Romain Rolland.