(a.) Leaping back; rebounding to a former position; recoiling\.

able to adapt adaptable adaptive adjustable airy alterable alterative bouncing bouncy bounding breezy buoyant carefree changeable checkered convalescent corky debonair effervescent elastic ever-changing expansive extensile flexible flexile fluid free and easy impermanent jaunty kaleidoscopic light lighthearted lightsome lively malleable many-sided metamorphic mobile modifiable movable mutable nonuniform perky permutable plastic protean proteiform rebounding recalcitrant recoiling recuperative recuperatory repercussive responsive reviviscent rubbery springing springy stretch stretchable stretchy supple transient transitory variable volatile whippy