Synonyms for Most has been:

• adj.

  •behind the times (adjective)
  • dated,
  • of the old school,
  • out of date,
  • unfashionable,
  • out-of-date,
  • old hat,
  • outdated,
  • old-fashioned,
  • antiquated,
  • has-been,
  • back-number,
  • square,
  • obsolete,
  • outmoded.
  •obsolete (adjective)
  • bygone,
  • disused,
  • archaic,
  • dead,
  • old-hat,
  • had it,
  • outworn,
  • dusty,
  • out-of-fashion,
  • anachronistic,
  • dead and gone,
  • moth-eaten,
  • superannuated,
  • gone,
  • kaput,
  • fossil,
  • timeworn,
  • stale,
  • antique,
  • antediluvian,
  • extinct,
  • discarded,
  • old-school,
  • horse and buggy,
  • ancient,
  • out,
  • old,
  • done for,
  • moldy,
  • dinosaur,
  • Superseded.
  •outdated/out-of-date (adjective)
  • musty,
  • behind the times,
  • anachronous,
  • back number,
  • out-of-style,
  • tired,
  • vintage,
  • not with it.
  •outmoded (adjective)
  • fossilized,
  • bent,
  • unusable,
  • obsolescent,
  • olden,
  • old-time,
  • unstylish.
  •passe (adjective)
  • yesterday,
  • belated.

Antonyms for Most has been:

• adj.

  • obsolete
    current, contemporary, up-to-date, in vogue, new, modern, present.
  • outdated
    young, recent.
  • outdated/out-of-date
    popular, fashionable.
  • outmoded
    new-fangled, fresh.
  • passe
    in.