flexible -- (capable of being changed; "flexible schedules")
flexible, flexile -- (able to flex; able to bend easily; "slim flexible birches")
elastic, flexible, pliable, pliant -- (able to adjust readily to different conditions; "an adaptable person"; "a flexible personality"; "an elastic clause in a contract")
flexible, whippy -- (bending and snapping back readily without breaking)
compromising, conciliatory, flexible -- (making or willing to make concessions; "loneliness tore through him...whenever he thought of...even the compromising Louis du Tillet")