Fast synonyms such as eat nothing, accelerated, affix, boon, debauched, a mile a minute, abstain from food, and deny oneself food. Fast is an adjective, and its antonyms are slow and slowly. Additionally, here are 170 synonyms and nearby words for fast as well as words beginning with F, Fa, Fas, and Fast.
170 synonyms for fast
1. speedy
accelerated
alacritous
blinding
blistering
breakneck
cracking
expeditious
express
fast-moving
fleet
fleet-footed
flying
hasty
high-speed
hurried
meteoric
nimble
nippy
pell-mell
quick
scorching
spanking
speedy
sporty
sprightly
supersonic
swift
tantivy
turbo
unhesitating
volant
whirlwind
2. secure
affix
anchor
chain
closed
connect
couple
fasten
fastened
fetter
firmly fixed
hitch
immovable
jammed
join
lash
moor
rope
secure
secured
shut
stiff
strap
tether
tie
tie up
to
truss
unbudgeable
yoke
3. loyal
as thick as thieves
boon
bosom
enduring
faithful
inseparable
lasting
staunch
steadfast
unchanging
unswerving
unwavering
4. wild
debauched
decadent
dissipated
dissolute
immoderate
immoral
intemperate
louche
profligate
rakish
self-indulgent
shameless
sinful
swinging
unrestrained
5. quickly
a mile a minute
apace
at a rate of knots
at full speed
at full tilt
at speed
at the speed of light
at warp speed
briskly
double quick
energetically
expeditiously
hastily
hell for leather
hurriedly
in a flash
in a hurry
in a trice
in a wink
in double quick time
in haste
in no time (at all)
in the blink of an eye
lickety-split
like (greased) lightning
like a bat out of hell
like a bomb
like a flash
like a scalded cat
like a shot
like an arrow from a bow
like billy-o
like mad
like nobody's business
like the clappers
like the deuce
like the wind
nippily
on the double
p.d.q. (pretty damn quick)
pell-mell
post-haste
speedily
swiftly
with all haste
with dispatch
without delay
6. refrain from eating
abstain from food
deny oneself food
diet
eat nothing
go hungry
go on hunger strike
go without food
hunger strike
period of abstinence
period of fasting
refrain from eating
starve oneself