1. fast

adjective. (ˈfæst) Acting or moving or capable of acting or moving quickly.
Synonyms
double-quick speedy express hurrying fastness smart quick red-hot high-velocity winged hot meteoric hurried straightaway alacritous speed scurrying rapid fleet accelerated immediate blistering high-speed fast-paced prompt instant sudden instantaneous windy swift swiftness fast-breaking
Antonyms
gradual slow unhurried looseness movableness
Etymology
fast (English)
fæst (Old English (ca. 450-1100))
fæstan (Old English (ca. 450-1100))

2. fast-flying

adjective. Moving swiftly.
Synonyms
moving flying
Antonyms
nonmoving immobile motionlessness

3. fast-growing

adjective. Tending to spread quickly.
Synonyms
strong-growing aggressive invasive
Antonyms
confined unassertive unaggressive defensive

4. fast

noun. (ˈfæst) Abstaining from food.
Synonyms
dieting hunger strike diet Ramadan abstinence fasting
Antonyms
legal nonradioactive uneager stale bad
Etymology
fast (English)
fæst (Old English (ca. 450-1100))
fæstan (Old English (ca. 450-1100))

5. fast

adverb. (ˈfæst) Firmly or closely.
Synonyms
tight
Antonyms
uncharged tasteless
Etymology
fast (English)
fæst (Old English (ca. 450-1100))
fæstan (Old English (ca. 450-1100))

6. fast

adjective. (ˈfæst) (of surfaces) conducive to rapid speeds.
Synonyms
smooth
Antonyms
rough nonviolent
Etymology
fast (English)
fæst (Old English (ca. 450-1100))
fæstan (Old English (ca. 450-1100))

7. fast

adjective. (ˈfæst) Unwavering in devotion to friend or vow or cause.
Synonyms
truehearted loyal firm faithful
Antonyms
unfaithful local acceleration deceleration movability
Etymology
fast (English)
fæst (Old English (ca. 450-1100))
fæstan (Old English (ca. 450-1100))

8. fast

verb. (ˈfæst) Abstain from certain foods, as for religious or medical reasons.
Synonyms
refrain desist diet abstain
Antonyms
consume unwanted stay in place linger decelerate
Etymology
fast (English)
fæst (Old English (ca. 450-1100))
fæstan (Old English (ca. 450-1100))

9. fast

adjective. (ˈfæst) Unrestrained by convention or morality.
Synonyms
debauched riotous degenerate libertine dissolute profligate immoral degraded dissipated
Antonyms
moral old wingless cool passionless
Etymology
fast (English)
fæst (Old English (ca. 450-1100))
fæstan (Old English (ca. 450-1100))

10. fast

adjective. (ˈfæst) Hurried and brief.
Synonyms
hurried flying quick
Antonyms
unhurried unexcitable unsexy cold
Etymology
fast (English)
fæst (Old English (ca. 450-1100))
fæstan (Old English (ca. 450-1100))
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