protean

from WordNet (r) 3.0 (2006)
protean
    adj 1: taking on different forms; "eyes...of that baffling
           protean grey which is never twice the same"
    
from The Collaborative International Dictionary of English v.0.48
Protean \Pro"te*an\, a.
   1. Of or pertaining to Proteus; characteristic of Proteus. "
      Protean transformations." --Cudworth.
      [1913 Webster]

   2. Exceedingly variable; readily assuming different shapes or
      forms; as, an am[oe]ba is a protean animalcule.
      [1913 Webster]
      [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
48 Moby Thesaurus words for "protean":
      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

    

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