WordWeb Online

1. Having no beneficial use or incapable of functioning usefully
   "a kitchen full of useless gadgets"; "she is useless in an emergency"
    
2. [informal] Lacking in power or forcefulness
   "an useless ruler";
   - ineffective, ineffectual, unable, wet [Brit, informal], pathetic, effete

See also: futile, impotent, ineffective, ineffectual, inutile, meaningless, otiose, unavailing, uneffective, unprofitable, unserviceable, unusable, unuseable, usefulness, utility

Antonym: useful

Encyclopedia: Useless