Synonyms for In haste:

• adv.

  •fast (adverb)
  • swiftly,
  • expeditiously,
  • promptly,
  • hurriedly,
  • in a flash,
  • quick,
  • post-haste,
  • like a shot,
  • apace,
  • quickly,
  • hastily,
  • pronto,
  • like greased lightning,
  • Posthaste,
  • like a flash.

Antonyms for In haste:

• adv.

  • fast
    loosely, slow, unfixedly, slowly.
  • quickly
    later, eventually.
  • rapidly
    sluggishly, leisurely.
  • Other antonyms:
    unhurriedly.