useless

adj.

[1]	ineffective , ineffectual , unserviceable , impractical , impracticable , unpractical , unavailing , vain , pointless , purposeless , idle , futile , unproductive , unsuccessful , impotent , effete , sterile , barren , abortive , unusable , bootless , worthless , (Rare) inutile
[2]	inefficient , incompetent , unproductive , ineffectual , ineffective , hopeless , inept