Entry Word: fast

Function: adjective

Meaning: 1 moving, proceeding, or acting with great speed <the fast pace of construction resulted in our new house being done ahead of schedule>

Synonyms breakneck, breathless, brisk, dizzy, fleet, fleet-footed, flying, hasty, lightning, nippy, quick, rapid, rapid-fire, rattling, snappy, speedy, swift, whirlwind

Related Words expeditious, prompt, ready; hurried, quickened; breathtaking; energetic, strenuous, strong, vigorous

Near Antonyms crawling, dawdling, laggard, lingering, plodding, poky (or pokey), slowish, sluggish, unhurried; deliberate, leisurely, measured; dilatory, late

Antonyms slow

2 firm in oneʼs allegiance to someone or something <the two girls soon became fast and inseparable friends> — see faithful 1
3 firmly positioned in place and difficult to dislodge <the rusty, old screws are so fast in the fitting that thereʼs no hope of getting them out> — see tight 2
4 given to or marked by cheating and deception <rolling back odometers was just one of the fast practices that the used-car dealer was guilty of> — see dishonest 2
5 marked by the ability to withstand stress without structural damage or distortion <as the storm approached, we checked to see that every thing on the outside of the house was fast and locked in position> — see stable 1