changeable (part of speech: adjective)
changeful, inconstant, fluid, reformable, convertible, alterable, movable, wavering, restless, precarious, transformable, vicissitudinous, flighty, mutable, ever-changing, irresolute, vacillating, protean, unsteady, fickle, unsettled, adjustable, shifting, unstable, varying, volatile, versatile, changeable, transposable, variable, mercurial, modifiable
willing (part of speech: adjective)
eager, receptive, pliable, flexible, acquiescent, pliant, persuadable, earnest, compliant, biddable, tractable, susceptible, ready, yielding, amenable, cooperative, malleable, ductile, submissive, willing, tame, assenting, agreeable, plastic
elastic (part of speech: adjective)
- It came from the most adaptable creature on Earth, said the robot. - "Mezzerow Loves Company", Floyd L. Wallace.
- So soon had this habit seemed to fasten upon her adaptable nature. - "The Boss of Little Arcady", Harry Leon Wilson.
- It is more adaptable, is in many places quite as reasonable in cost, and is cleaner and safer. - "The Complete Home", Various.