flexible

capable of being changed; "flexible schedules"

able to flex; able to bend easily; "slim flexible birches"

able to adjust readily to different conditions; "an adaptable person"; "a flexible personality"; "an elastic clause in a contract"

bending and snapping back readily without breaking

making or willing to make concessions; "loneliness tore through him...whenever he thought of...even the compromising Louis du Tillet"