(n.) The state of being unnecessary; something unnecessary.

bankruptcy breakage breakdown collapse crack-up crippling damage decay destruction deterioration detriment dilapidation disablement encroachment functionlessness harm hobbling hurt hurting impairment inapplicability incapacitation infringement injury inoperability inoperativeness inroad inutility loss maiming mayhem mischief mutilation needlessness otiosity ruin ruination ruinousness sabotage scathe sickening spoiling superfluousness unemployability unfitness unhelpfulness unnecessity unserviceability unsuitability unusability uselessness weakening