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Definitions

fast

[fast, fahst] / fæst, fɑst /
ADJECTIVE
speedy
Synonyms
STRONGEST
agile brisk hot nimble quick rapid swift
STRONG
accelerated active dashing electric flashing fleet fleeting flying hurried racing ready snap split-second winged
WEAK
PDQ blue streak breakneck double-time expeditious expeditive hairtrigger hasty hypersonic in a jiffy in nothing flat lickety split like a bat out of hell like all get out like crazy like mad on the double posthaste presto pronto screamin' snappy speedball supersonic velocious
Antonyms
STRONGEST
clumsy slow
STRONG
dull
WEAK
plodding tardy unhurried
ADJECTIVE
fixed, immovable
Synonyms
STRONGEST
durable stable sure tight true
STRONG
adherent attached close constant constrained faithful fastened firm fortified glued held lasting permanent secure set sound staunch stuck wedged
WEAK
ardent impregnable indelible inextricable loyal resistant resolute steadfast tenacious true blue unwavering
Antonyms
STRONGEST
wobbly
STRONG
changeable disloyal ephemeral flexible inconstant indefinite irresolute loose moving temporary unattached unfixed unstable
WEAK
impermanent insecure movable uncertain
ADJECTIVE
immoral, promiscuous
Synonyms
STRONGEST
easy loose
STRONG
bawdy debauched depraved dissipated gadabout libertine light profligate wanton wild
WEAK
careless devil-may-care dissolute extravagant flirtatious frivolous giddy incontinent indecent intemperate lascivious lecherous lewd libidinous licentious lustful rakish reckless salacious self-gratifying self-indulgent sportive sporty unchaste
Antonyms
STRONGEST
strict
STRONG
chaste decent good moral nice pure uncorrupt virtuous
WEAK
upright
ADVERB
speedily
Synonyms
STRONGEST
quick quickly rapidly soon swift swiftly
WEAK
apace chop-chop expeditiously flat-out fleetly full tilt hastily hurriedly in a flash in haste in nothing flat in short order like a flash like a shot like greased lightning like wildfire posthaste presto promptly pronto
Antonyms
STRONGEST
slowly
WEAK
slow
ADVERB
fixedly
Synonyms
STRONGEST
hard tight
STRONG
firm
WEAK
deeply firmly securely solidly soundly steadfastly tightly
Antonyms
WEAK
loosely unfixedly
NOUN
abstention from eating
Synonyms
STRONG
abstinence diet fasting
WEAK
xerophagy
Antonyms
STRONG
indulgence
WEAK
eating feast gluttony gorging stuffing
VERB
go without food
Synonyms
STRONGEST
abstain
STRONG
diet famish forbear refrain starve
WEAK
deny oneself go hungry not eat
Antonyms
STRONG
indulge
WEAK
eat glut gorge stuff

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The reasons for moving on—or at least trying a new one—are piling up fast.

From The Wall Street Journal • Apr. 11, 2026

He pointed to some signs that stocks may have risen too far, too fast.

From MarketWatch • Apr. 11, 2026

Within a few years, the career of this slow-paced Houston native has moved fast.

From Los Angeles Times • Apr. 10, 2026

The fact that AI platforms are changing exceedingly fast only makes that question trickier—and more important.

From Barron's • Apr. 9, 2026

‘What do you want us to do?’ said Torak, his heart hammering as fast as Wolf’s.

From "Wolf Brother" by Michelle Paver

Vocabulary lists containing fast

This Week in Words: Current Events Vocab for April 10–April 16, 2021

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myPerspectives 9.6

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Unit 4

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