Synonyms for So-and-so:

• adj.

  •unknown (adjective)
  • far,
  • far-off,
  • Incog,
  • faraway,
  • unrevealed,
  • nameless,
  • far off,
  • Unapprehended,
  • hidden,
  • unheard of,
  • secret,
  • distant,
  • untold,
  • unfamiliar,
  • foreign,
  • alien,
  • concealed,
  • such and such,
  • undistinguished,
  • uncharted,
  • unnamed,
  • remote,
  • uncelebrated,
  • unidentified,
  • dark,
  • incognito,
  • humble,
  • unheard-of,
  • unperceived,
  • unexplained,
  • unnoted,
  • undiscovered,
  • Unrenowned,
  • new,
  • unsung,
  • Unascertained,
  • desolate,
  • anonymous,
  • unexplored,
  • little known,
  • exotic,
  • such-and-such,
  • unrecognized,
  • strange.

• n.

  •
  • know-all,
  • public nuisance,
  • yob,
  • (the) scum of the earth,
  • horror,
  • public enemy number one,
  • loudmouth.
  •
  • widget,
  • X,
  • something.
  •bum (noun)
  • bum.
  •crumb (noun)
  • crumb.
  •puke (noun)
  • puke.
  •rat (noun)
  • rat.
  •rotter (noun)
  • rotter.
  •scum bag (noun)
  • scum bag.
  •skunk (noun)
  • skunk.
  •so-and-so (noun)
  • stinkpot,
  • lowlife,
  • stinker.
  •somebody (noun)
  • luminary,
  • superstars,
  • name,
  • so and so,
  • notable,
  • personage,
  • some person,
  • dignitary,
  • heavyweight,
  • celebrity,
  • superstar,
  • household name,
  • Ones,
  • public figure,
  • vip,
  • person of note,
  • someone,
  • star,
  • one,
  • Whoever.

• Other synonyms:

  •
  • doohickey,
  • thingy,
  • doodah,
  • whatsisname,
  • doodad,
  • whatsername,
  • whatchamacallit.
  •
  • stuff.

Antonyms for So-and-so:

• adj.

  • unknown
    known, Familiar, common, native, regular, relevant, usual, normal, named, identified.

• n.

  • somebody
    unknown, nobody.
  • Other antonyms:
    gentleman, hero, saint, angel, heroine, role model, idol, lady.