Synonyms of speedy

1 Syllable
prompt, brisk, swift, fleet, flying
2 Syllables
winging, ready, quick-fire, breakneck, volant, wanton, headlong, zippier, wantons, dizzying, express, snappy, racing, swiftest, avian, hasty, fleetest, prompter, rapid, zippy, whirlwind, volar, swifter, hurried, half-assed, brisker, nimble, speedball, fleeter, winged
3 Syllables
active, immoral, rapider, overnight, rapid-fire, barrelling, double-quick, fleet-footed, airborne, summary, volitant, gassed-up, pepped-up, pumped-up, cyclonic, revved-up, cursory, fleetfooted, agile, lissome, lively, posthaste, meteoric, barreling
4 Syllables
supersonic, alacritous, ultrasonic, supercharged, adulterous, exertive, immediate, harefooted, expeditious, nimble-footed
5 Syllables
precipitate, accelerated
6 Syllables
extracurricular