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