Synonyms for Pre-existent:

• adj.

  •all (adjective)
  • pre-existent.
  •early (adjective)
  • presently,
  • bright and early,
  • with time to spare,
  • prematurely,
  • on the dot,
  • soon,
  • quick,
  • Proximately,
  • beforehand,
  • betimes,
  • ahead of time,
  • too soon,
  • in good time,
  • in the bud,
  • ere long,
  • briefly,
  • shortly,
  • in time,
  • before long,
  • a bit previous,
  • early bird,
  • promptly,
  • far ahead,
  • on short notice,
  • ANON,
  • in advance,
  • immediately,
  • pronto,
  • unexpectedly,
  • directly,
  • Oversoon,
  • previous.
  •Other relevant words: (adjective)
  • preceding,
  • ahead.
  •preceding (adjective)
  • aforeknown,
  • other,
  • past,
  • above-mentioned,
  • preliminary,
  • supra,
  • aforesaid,
  • Pioneering,
  • Precursive,
  • erstwhile,
  • lead,
  • heretofore,
  • prefatory,
  • preparatory,
  • introductory,
  • one time,
  • precursory,
  • before,
  • ahead of,
  • forward,
  • prevenient,
  • prodromal,
  • above-named,
  • aforementioned,
  • forerunning,
  • head,
  • pioneer,
  • front,
  • leading.

• n.

  •Other relevant words: (noun)
  • preexisting,
  • pre-existing,
  • preexistent.

• Other synonyms:

  •Other relevant words (noun):
  • precedent,
  • former,
  • prior,
  • anterior,
  • foregoing,
  • antecedent.

Antonyms for Pre-existent:

• adj.

  • early
    later, late.
  • preceding
    below, last, inferior, following, back, unimportant, after.
  • prior
    present, current, future, subsequent.