Synonyms of double-quick

1 Syllable
prompt, short, swift, fleet, quick, flying
2 Syllables
ready, breakneck, headlong, speedy, screaming, abrupt, express, snappy, swiftly, cracking, swiftest, spanking, hasty, rapid, sudden, swifter, hurried, pronto, nimble, speedball, winged
3 Syllables
barrelling, fleet-footed, short-lived, fleetfooted, posthaste, hastily
4 Syllables
supersonic, alacritous, unexpected, expeditious
5 Syllables
precipitate
7 Syllables
unpremeditatedly