protean (adj.)

• adaptable
• adjustable
• allotropic
• alterable
• alterative
• changeable
• changeful
• checkered
• ever-changing
• flexible
• fluid
• impermanent
• kaleidoscopic
• labile
• malleable
• manifold
• many-sided
• metamorphic
• mobile
• modifiable
• movable
• multifarious
• multiform
• multiphase
• multiple
• multiplex
• mutable
• nonuniform
• permutable
• plastic
• polymorphic
• polymorphous
• resilient
• rubbery
• supple
• transient
• transitory
• unsettled
• unstable
• unsteady
• variable