supersonic [soo-per-son-ik]  
Main Entry:
fast  [fast, fahst]
Part of Speech: adjective
Definition: speedy
Synonyms: PDQ, accelerated, active, agile, blue streak, breakneck, brisk, chop-chop, dashing, double-time, electric, expeditious, expeditive, flashing, fleet, fleeting, flying, hairtrigger, hasty, hot, hurried, hypersonic, in a jiffy, in nothing flat, lickety split, like a bat out of hell, like all get out, like crazy, like mad, nimble, on the double, posthaste, presto, pronto, quick, racing, rapid, ready, screamin', snap*, snappy, speedball, supersonic, swift, velocious, winged
Antonyms: plodding, slow, tardy, unhurried
* = informal/non-formal usage
Main Entry: speedy
Part of Speech: adjective
Definition: fast, quick
Synonyms: accelerated, agile, alacritous, breakneck, brisk, expeditious, express, fleet, harefooted, hasty, headlong, hurried, immediate, lissome, lively, nimble, precipitate, prompt, quick-fire, rapid, rapid-fire, ready, snappy, summary, supersonic, swift, ultrasonic, winged
Antonyms: delayed, halted, slowed, tardy
Main Entry: swift
Part of Speech: adjective
Definition: very fast
Synonyms: abrupt, alacritous, barrelling, breakneck, cracking, double-quick, expeditious, express, fleet, fleet-footed, flying, hasty, headlong, hurried, in nothing flat, like crazy, like mad, nimble, on the double, precipitate, prompt, pronto, quick, rapid, ready, screaming, shaking a leg, short, short-lived, snappy, spanking, speedball, speedy, sudden, supersonic, unexpected, winged
Antonyms: delayed, slow, sluggish
Roget's 21st Century Thesaurus, Third Edition
Copyright © 2012 by the Philip Lief Group.
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