[Middle English, from Old French superflueux, from Latin superfluus, from superfluere, to overflow : super-, super- + fluere, to flow; see bhleu- in Indo-European roots.]
su·perflu·ous·ly adv.
su·perflu·ous·ness n.
Synonyms: superfluous, excess, extra, spare, supernumerary, surplus These adjectives mean being more than is needed, desired, required, or appropriate: delete superfluous words; trying to lose excess weight; found some extra change on the dresser; sleeping in the spare room; supernumerary ornamentation; distributed surplus food to the needy.
superfluous /sprflus/ adj. more than is needed or wanted: He worked so well that my help was superfluous.