posthaste

adv. quickly, hastily; speedily, rapidly, fast

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

(adv.)
With speed or expedition; as, he traveled posthaste; to send posthaste.
  

Synonyms and related words:
amain, apace, at flank speed, breakneck, by airmail, by cable, by express, by return mail, by telegraph, double-quick, expeditious, expeditiously, express, fast, flat-out, fleet, full tilt, hand over fist, hand over hand, hastily, hasty, hell for leather, hell-bent, hell-bent for election, in double time, in double-quick time, in high, in high gear, in posthaste, in seven-league boots, lickety-cut, lickety-split, on the double, post, promptly, quick, quickly, rapid, rapidly, snappily, speedily, speedy, swift, swiftly, trippingly, under forced draft, whip and spur, with all haste, with giant strides, with rapid strides, with speed
  

[GB] IN GRAN FRETTA

adv. อย่างรวดเร็วมาก (syn. swiftly, speedily, hastily)