English-Thai Dictionary
posthaste
ADV อย่างรวดเร็ว มาก swiftly speedily hastily yang-ruad-reo
Webster's 1913 Dictionary
POSTHASTE
POSTHASTE Post `haste ", n.
Defn: Haste or speed in traveling, like that of a post or courier. Shak.
POSTHASTE
POSTHASTE Post `haste, adv.
Defn: With speed or expedition; as, he traveled posthaste; to send posthaste. Shak.
New American Oxford Dictionary
posthaste
post haste |ˈpōstˈhāst poʊstˈheɪst | ▶adverb with great speed or immediacy: she would go posthaste to England. ORIGIN mid 16th cent.: from the direction “haste, post, haste, ” formerly given on letters.
American Oxford Thesaurus
posthaste
posthaste adverb he departed posthaste for Venice: as quickly as possible, without delay, (very ) quickly, speedily, without further /more ado, with all speed, promptly, immediately, at once, straightaway, right away; informal pronto, straight off.
The Wordsmith Dictionary