superfluous
adj.
early 15c. (earlier superflue, late 14c.), from Latin superfluus "unnecessary," literally "overflowing, running over," from superfluere "to overflow," from super "over" (see super-) + fluere "to flow" (see fluent). Related: Superfluously; superfluousness.
〔李〕[super-=over超；flu=to flow流；-ous=-ing⇒“flowing over溢出的”→] a.more than is needed；surplus，un-necessary过剩的；多余的，不必要的
〔蒋〕[super-超过→过多，flu流，-ous形容词后缀，…的] 过剩的，多余的
〔李〕[super-=beyond超出；flu=to flow流；-ous a.=having the quality有……性质的→“having the quality of flowing beyond or over流过界的”→] a. overflowing;above what is enough过剩的；多余的