CONCERTED

[adjective] [usually before noun] - planned or done together for a shared purpose, or (of an attempt to do something) determined and seriousShe said that the richer countries of the world should take concerted action to help the poorer countries.The D-Day invasion of Normandy in 1944 was a concerted exercise by the armed forces of Britain, the US and Canada.There has been a concerted (= determined) campaign against the proposals.He's making a concerted (= determined) effort/attempt to improve his appearance