Definition for Posthaste:

• With utmost speed.

Synonyms for Posthaste:

• adj.

  •fast (adjective)
  • like crazy,
  • flashing,
  • like a bat out of hell,
  • double-time,
  • like all get out,
  • hypersonic,
  • hairtrigger,
  • in nothing flat,
  • velocious,
  • like mad,
  • speedball,
  • post-haste,
  • snapper,
  • in a jiffy,
  • screamin',
  • Expeditive,
  • BLUE STREAK.
  •quick (adjective)
  • ex-press,
  • most harefooted,
  • lead out,
  • more harefooted,
  • ex press.

• adv

  •fast (adverb)
  • in haste,
  • like a shot,
  • like wildfire,
  • like a flash,
  • like greased lightning,
  • in short order.
  •hastily (adverb)
  • thoughtlessly,
  • on spur of moment,
  • heedlessly,
  • agilely,
  • on spur of the moment,
  • too quickly,
  • Subito,
  • Unpremeditatedly.
  •pell-mell (adverb)
  • Pellmell,
  • precipitiously,
  • Incontinently.
  •soon (adverb)
  • in time,
  • coming down the pike,
  • in a little while,
  • in a second,
  • in due time,
  • in a minute,
  • by and by,
  • in a short time,
  • before long,
  • any minute now.

• adv.

  •fast (adverb)
  • hurriedly,
  • straightaway,
  • directly,
  • fleetly.
  •hastily (adverb)
  • precipitately.
  •promptly (adverb)
  • un hesitatingly,
  • un-hesitatingly,
  • on dot.
  •rapidly (adverb)
  • in hurry,
  • in rush.
  •soon (adverb)
  • soonest,
  • ere long.

• Other synonyms:

  •
  • Lickety Split,
  • pronto.
  •
  • flat out.

Antonyms for Posthaste:

• adv.

  • Other antonyms:
    leisurely, slow, slowly, tardily, deliberately, sluggishly, lingeringly, laggardly, belatedly, ploddingly.

Posthaste Sentence Examples:

• It appears he got a fortnight's leave, and came posthaste to London to find you.

• He knew then that there could be but one answer, and he headed for the control room posthaste.