Synonyms of posthaste
- 1 Syllable
- swift, soon, fleet, quick, fast, pdq
- 2 Syllables
- fasted, promptly, breakneck, headlong, flat-out, speedy, quickest, fastest, swiftly, quicker, soonest, quickly, hasty, sooner, asap, pell-mell, rapid, chop-chop, fleetly, faster, pronto
- 3 Syllables
- double-quick, speedily, directly, rapidly, apace, punctually, straightaway, double-time, screamin', hastily
- 4 Syllables
- hypersonic, lickety-split, harefooted, expeditious
- 5 Syllables
- incontinently
- 6 Syllables
- precipitately
- 7 Syllables
- unpremeditatedly