superfluous

Từ điển American Heritage Dictionary 4th

su·per·flu·ous (so͝o-pûrʹflo͞o-əs)adj.
Being beyond what is required or sufficient. [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·perʹflu·ous·ly adv.su·perʹflu·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.

• Từ đồng nghĩa / Synonyms:
  excess, extra, redundant, spare, supererogatory, supernumerary, surplus, otiose, pointless, purposeless, senseless, wasted