WordNet sense 1 (a narrow band of elastic rubber used to hold things (such as papers) together):

rubber band, elastic band

WordNet sense 2 (able to adjust readily to different conditions):

pliable, pliant

WordNet sense 3 (capable of adapting (of becoming or being made suitable) to a particular situation or use):

adaptable

WordNet sense 4 (capable of being easily stretched and resuming former size or shape):

stretchable, stretchy

WordNet sense 5 (bending and snapping back readily without breaking):

flexible, whippy

WordNet sense 6 (capable of being molded or modeled (especially of earth or clay or other soft material)):

fictile, plastic

WordNet sense 7 (elastic; rebounds readily):

lively, resilient, springy