Adverb

(en adverb)

With speed; in a rapid manner.

*

, title=(The Celebrity), chapter=5 , passage=We expressed our readiness, and in ten minutes were in the station wagon, rolling rapidly down the long drive, for it was then after nine. We passed on the way the van of the guests from Asquith.}}

*{{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= The attack of the MOOCs , passage=Since the launch early last year of […] two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. University brands built in some cases over centuries have been forced to contemplate the possibility that information technology will rapidly make their existing business model obsolete.}}

Adverb

(-)

quickly, as fast as someone travelling post; with great speed

It is imperative that you finish your task posthaste .

* 1946 — , Ch. 17

"Sasi cannot last through the night." These words from his physician, and the spectacle of my friend, now reduced almost to a skeleton, sent me posthaste to Serampore.