Synonyms for Double-quick:

• adj.

  •all (adjective)
  • double-quick.
  •swift (adjective)
  • precipitate,
  • hurried,
  • screaming,
  • short,
  • nimble,
  • winged,
  • snappy,
  • prompt,
  • unexpected,
  • abrupt,
  • sudden,
  • short-lived,
  • flying,
  • express,
  • spanking,
  • ready,
  • on the double,
  • cracking.

• a. & adv.

  •posthaste (adjective, adverb)
  • most directly.

• adv

  •fast (adverb)
  • Posthaste.
  •hastily (adverb)
  • Lickety Split,
  • on spur of moment.

• adv.

  •hastily (adverb)
  • Unpremeditatedly,
  • rapidly,
  • agilely,
  • hastily,
  • swiftly,
  • apace,
  • carelessly,
  • hurriedly,
  • impetuously,
  • suddenly,
  • recklessly,
  • prematurely,
  • rashly,
  • lickety-split,
  • Subito,
  • precipitately,
  • impulsively,
  • promptly,
  • flat-out,
  • on spur of the moment,
  • thoughtlessly,
  • straightaway,
  • speedily,
  • nimbly,
  • heedlessly,
  • too quickly,
  • expeditiously,
  • quickly.
  •posthaste (adverb)
  • hasty,
  • rapid,
  • fleet,
  • directly,
  • quick,
  • headlong,
  • expeditious,
  • swift,
  • speedy,
  • pell-mell,
  • pronto,
  • breakneck.
  •swiftly (adverb)
  • hotfoot.

• n.

  •double-quick (noun)
  • fast.
  •double time (noun)
  • haste.

• Other synonyms:

  •adj.
  • fleet-footed,
  • in nothing flat,
  • alacritous,
  • like crazy,
  • like mad,
  • supersonic,
  • Barrelling,
  • shaking a leg,
  • speedball.
  •a. & adv.
  • post-haste.
  •adv
  • at once,
  • fleetly,
  • in no time,
  • Pellmell,
  • full tilt,
  • without warning,
  • more rapidly.
  •adv.
  • without losing time.
  •n.
  • double time,
  • double-time,
  • double march,
  • forced march,
  • slow jog.

Antonyms for Double-quick:

• adj.

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

• adv.

  • hastily
    delayed, slowly.
  • swiftly/swift
    sluggishly.