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posthaste

[pohst-heyst] /ˈpoʊstˈheɪst/
adverb
1.
with the greatest possible speed or promptness:
to come to a friend's aid posthaste.
noun
2.
Archaic. great haste.
Origin
1530-1540
1530-40; post3 + haste
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for post haste

posthaste

/ˈpəʊstˈheɪst/
adverb
1.
with great haste; as fast as possible
noun
2.
(archaic) great haste
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for post haste

posthaste

adv.

1590s, from a noun (1530s) meaning "great speed," usually said to be from "post haste" instruction formerly written on letters (attested from 1530s), from post (adv.) + haste (n.). The verb post "to ride or travel with great speed" is recorded from 1550s.

Online Etymology Dictionary, © 2010 Douglas Harper
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post haste in Culture
posthaste [(pohst-hayst)]

Immediately, with great speed: “Get the flood warning to the media posthaste.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Difficulty index for posthaste

Few English speakers likely know this word

Word Value for post

6
7
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