Springy, resilient (7)
I believe the answer is:
elastic
I believe this is a double definition.
'springy' is the first definition.
(similar in meaning)
'resilient' is the second definition.
(similar in meaning)
(Other definitions for elastic that I've seen before include "capable of adapting to change?" , "Able to stretch" , "Castile (anag)" , "Something stretchy" , "Tape containing flexible rubber" .)