Synonyms of speediest

1 Syllable
prompt, brisk, swift, fleet
2 Syllables
ready, quick-fire, breakneck, headlong, express, snappy, hasty, rapid, hurried, nimble, winged
3 Syllables
rapid-fire, summary, agile, lissome, lively
4 Syllables
supersonic, alacritous, ultrasonic, immediate, harefooted, expeditious
5 Syllables
precipitate, accelerated