Adjective outstanding has 4 senses
  1. outstanding - distinguished from others in excellence; "did outstanding work in human relations"; "an outstanding war record"
    inferior (indirect, via superior)
  2. outstanding, prominent, salient, spectacular, striking - having a quality that thrusts itself into attention; "an outstanding fact of our time is that nations poisoned by anti semitism proved less fortunate in regard to their own freedom"; "a new theory is the most prominent feature of the book"; "salient traits"; "a spectacular rise in prices"; "a striking thing about Picadilly Circus is the statue of Eros in the center"; "a striking resemblance between parent and child"
    Antonyms: inconspicuous, invisible (indirect, via conspicuous)
  3. great, outstanding - of major significance or importance; "a great work of art"; "Einstein was one of the outstanding figures of the 20th century"
    Antonym: minor (indirect, via major)
  4. outstanding, owed, owing, undischarged - owed as a debt; "outstanding bills"; "the amount still owed"; "undischarged debts"
    Antonym: paid (indirect, via unpaid)