Synonyms for Most double-quick:

• adj.

  •swift (adjective)
  • flying,
  • abrupt,
  • snappy,
  • winged,
  • speedball,
  • screaming,
  • prompt,
  • unexpected,
  • in nothing flat,
  • short,
  • hurried,
  • sudden,
  • short-lived,
  • precipitate,
  • on the double,
  • Barrelling,
  • express,
  • like mad,
  • ready,
  • spanking,
  • cracking,
  • fleet-footed,
  • nimble,
  • like crazy,
  • alacritous,
  • supersonic,
  • shaking a leg.

• adv.

  •posthaste (adverb)
  • fleet,
  • hasty,
  • breakneck,
  • full tilt,
  • straightaway,
  • headlong,
  • rapidly,
  • fleetly,
  • directly,
  • pronto,
  • swift,
  • lickety-split,
  • hastily,
  • rapid,
  • speedily,
  • quick,
  • flat-out,
  • quickly,
  • double-quick,
  • expeditious,
  • promptly,
  • pell-mell,
  • speedy,
  • swiftly,
  • at once.

Antonyms for Most double-quick:

• adj.

  • swift
    lazy, delayed, slow, sluggish, leisurely, expected.