superfluous in WordNet English dictionary

1. more than is needed, desired, or required
   "trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ornamentation"; "it was supererogatory of her to gloat"; "delete superfluous (or unnecessary) words"; "extra ribs as well as other supernumerary internal parts"; "surplus cheese distributed to the needy"
   excess  extra  redundant  spare  supererogatory  superfluous  supernumerary  surplus 
   
2. serving no useful purpose; having no excuse for being
   "otiose lines in a play"; "advice is wasted words"; "a pointless remark"; "a life essentially purposeless"; "senseless violence"
   otiose  pointless  purposeless  senseless  superfluous  wasted