able to adapt, adaptable, adjustable, alterable, alterative, anemic, asthenic, bloodless, changeable, checkered, chicken, cowardly, debilitated, drooping, droopy, dull, effete, etiolated, ever-changing, faint, faintish, feeble, flabby, flaccid, flexible, flimsy, floppy, fluid, gone, gutless, imbecile, impermanent, impotent, kaleidoscopic, languid, languorous, lax, limber, limp, listless, loose, lustless, malleable, many-sided, marrowless, metamorphic, mobile, modifiable, movable, mutable, nerveless, nonuniform, permutable, pithless, plastic, pooped, powerless, protean, proteiform, relaxed, resilient, rubber, rubberized, rubberlike, sapless, sinewless, slack, soft, spineless, strengthless, supple, transient, transitory, unhardened, unnerved, unstrung, variable, weak, weakly