Posthaste

مترادف و متضاد posthaste

1. adjective, adverb fast
   Synonyms: at once, breakneck, directly, double-quick, expeditious, flat-out, fleet, fleetly, full tilt, hastily, hasty, headlong, lickety-split, pell-mell, promptly, pronto, quick, quickly, rapid, rapidly, speedily, speedy, straightaway, swift, swiftly
   Antonyms: eventually, slow, slowly