able to go back to the normal or previous size or shape after being pulled or pressed

pliant, rubbery

easily bent without breaking; (of plans etc) easily changed to suit new conditions

pliable, bendable

quick and graceful in movement

supple

a tough, elastic substance made from the milky liquid that flows from certain trees when the bark is cut, used for making tyres etc

elastic

easily bending, not stiff

bendable