Posthaste

//ˌpəʊstˈheɪst// adv, noun

adv, noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    Alternative spelling of post-haste. alt-of, alternative, uncountable

    ""And this, I take it, Is the main motive of our preparations The source of this our watch, and the chief head Of this post-haste and rummage in the land.""

Adverb
  1. 1
    Quickly, as fast as someone travelling post; with great speed. dated, formal, not-comparable

    "It is imperative that you finish your task posthaste."

Synonyms

All synonyms
amainapaceasahpasapasapat flank speed

Example

More examples

"It is imperative that you finish your task posthaste."

Etymology

From the former instruction on letters ‘haste, post, haste’, later reinterpreted as a compound of post + haste.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.