Adjective superfluous has 2 senses
- otiose, pointless, superfluous, wasted - serving no useful purpose; having no excuse for being; "otiose lines in a play"; "advice is wasted words"
Antonym: valuable (indirect, via worthless)
- excess, extra, redundant, spare, supererogatory, superfluous, supernumerary, surplus - 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"
Antonym: necessary (indirect, via unnecessary)
,