This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. With great speed; rapidly.

n. Archaic Great speed; rapidity.

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

n. Alternative spelling of post-haste.

n. Haste or speed in traveling, like that of a post or courier.

ad. With speed or expedition

n. Haste or speed like that of a post or courier in traveling.

With the haste of a post; with speed or urgent expedition: as, he traveled post-haste.

Expeditious; speedy; immediate.

[The edition of 1623 reads “post, post-haste.”]

ad. as fast as possible; with all possible haste

"A dozen miles to the north, the defeated Istarian army huddled against the outer walls of the city, awaiting reinforcements recalled posthaste from their stations along the Thoradin border."

quickly    ASAP   

nosebag    unobtrusiveness    diacylglycerol    leastwise    wist