Synonyms of quickest

1 Syllable

prompt, brisk, keen, going, swift, curt, spry, fleet, brief, flying

2 Syllables

alert, breakneck, headlong, sprightly, abrupt, express, snappy, hasty, asap, rapid, sudden, hurried, pronto, nimble, winged

3 Syllables

active, mercurial, cursory, impatient, impetuous, agile, spirited, lively, posthaste

4 Syllables

perfunctory, instantaneous, immediate, harefooted, animated, expeditious, energetic

5 Syllables

accelerated, expeditive