The Collaborative International Dictionary of English v.0.48:

Adaptable \A*dapt"a*ble\, a.
   Capable of being adapted.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adaptable
    adj 1: capable of adapting (of becoming or being made suitable)
           to a particular situation or use; "to succeed one must be
           adaptable"; "the frame was adaptable to cloth bolts of
           different widths" [ant: unadaptable]

Moby Thesaurus II by Grady Ward, 1.0:

107 Moby Thesaurus words for "adaptable":
   able to adapt, accessible, accommodative, acquiescent, adaptive,
   adjustable, all-around, alterable, alterative, ambidextrous,
   amphibious, at hand, available, bendable, bending, bouncy, buoyant,
   changeable, checkered, complaisant, compliant, conformable,
   convenient, ductile, elastic, ever-changing, extensible, extensile,
   fabricable, facile, feasible, fictile, flexible, flexile, flexuous,
   fluid, foolproof, formable, formative, generally capable, giving,
   handy, impermanent, impressible, impressionable, kaleidoscopic,
   like putty, limber, lissome, lithe, lithesome, lively, malleable,
   manageable, maneuverable, many-sided, metamorphic, mobile,
   modifiable, moldable, movable, mutable, nonuniform, obedient,
   of all work, on call, on deck, on hand, on tap, other-directed,
   permutable, plastic, pliable, pliant, practical, protean,
   proteiform, ready, receptive, resilient, resourceful, responsive,
   rubbery, sensitive, sequacious, shapable, springy, stretch,
   stretchable, stretchy, submissive, supple, susceptible, to hand,
   tractable, tractile, transient, transitory, two-handed,
   untroublesome, variable, versatile, whippy, wieldable, wieldy,
   willowy, yielding