WordNet sense 1 (tending to give in or surrender or agree):

yielding

WordNet sense 2 (making or willing to make concessions):

compromising, conciliatory

WordNet sense 3 ((used of e.g. personality traits) readily adaptable):

limber, supple

WordNet sense 4 (capable of being bent or flexed or twisted without breaking):

bendable, pliable, pliant

WordNet sense 5 (able to flex; able to bend easily):

flexile

WordNet sense 6 (bending and snapping back readily without breaking):

whippy

WordNet sense 7 (capable of resuming original shape after stretching or compression; springy):

elastic