a life essentially purposeless.
a pointless remark.
advice is wasted words.
delete superfluous (or unnecessary) words.
extra ribs as well as other supernumerary internal parts.
found some extra change lying on the dresser.
it was supererogatory of her to gloat.
otiose lines in a play.
senseless violence.
skills made redundant by technological advance.
sleeping in the spare room.
supernumerary ornamentation.
surplus cheese distributed to the needy.
trying to lose excess weight.
yet another book on heraldry might be thought redundant.