1. (a.) Of or pertaining to Proteus; characteristic Of Proteus.

2. (a.) Exceedingly variable; readily assuming different shapes or forms; as, an amoeba is a protean animalcule.

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