what is the meaning of 'Futility'?

If something was futile, it would be considered useless or pointless.

futility basically means the senslessness of the war.in this poem all the attempts to wake a dead soldier are futile. this is a very sad poem as it emphasizes how war has robbed these soldiers of their lives. the death of one soldier also touches the persona and the others around showing that the soldiers were united in fighting this senseless war and were all affected by the pain