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ENGLISH · A WORD WITH POSSIBILITIES

posthaste.

Quickly, as fast as someone travelling post; with great speed.

9 characters2 syllables approx.English language

Meaning & usage

adv/ˌpəʊstˈheɪst/Received-Pronunciation/ˌpoʊstˈheɪst/US
  1. Quickly, as fast as someone travelling post; with great speed.

    dated · formal · not-comparable
    It is imperative that you finish your task posthaste.
Where this word comes from

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

noun/ˌpəʊstˈheɪst/Received-Pronunciation/ˌpoʊstˈheɪst/US
  1. Alternative spelling of post-haste.

    alt-of · alternative · uncountable
Where this word comes from

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

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.