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Synonyms for post haste
adv fast

breakneck
directly
expeditious
flat-out
fleet
hastily
hasty

headlong
lickety-split
pell-mell
promptly
pronto
quick
quickly

rapid
rapidly
speedily
speedy
swift
swiftly
straightaway

at once
double-quick
fleetly
full tilt

Synonyms
adj speedy

rapid
agile
brisk
nimble
hot
quick
swift
fleeting
electric
flying
hurried
ready

accelerated
dashing
snap
fleet
racing
active
breakneck
expeditious
hasty
on the double
posthaste
presto

pronto
snappy
winged
flashing
PDQ
blue streak
chop-chop
double-time
expeditive
hairtrigger
hypersonic
in a jiffy

in nothing flat
lickety split
like a bat out of hell
like all get out
like crazy
like mad
speedball
supersonic
velocious
screamin’

Antonyms

clumsy
sluggish
boring
tardy
unhurried
impermanent

movable
unattached
moral
slow
dull
plodding

flexible
insecure
loose
unfixed
good
upright

Synonyms
adv speedily

rapidly
swiftly
soon
quickly
quick
swift
apace

flat-out
hastily
in a flash
posthaste
presto
promptly
pronto

chop-chop
expeditiously
fleetly
full tilt
hurriedly
in haste
in nothing flat

in short order
like a flash
like a shot
like greased lightning
like wildfire

Antonyms

slowly
slow

loosely
unfixedly

Synonyms
adv with great speed

suddenly
swiftly
nimbly
speedily
quickly
prematurely
carelessly
promptly

apace
fast
flat-out
impetuously
impulsively
lickety-split
posthaste
rapidly

rashly
recklessly
straightaway
hurriedly
agilely
double-quick
expeditiously
heedlessly

on spur of the moment
precipitately
subito
thoughtlessly
too quickly
unpremeditatedly

Antonyms

slowly

delayed

Synonyms
adv hurriedly and carelessly

foolishly
hastily
headlong
helter-skelter

impetuously
indiscreetly
posthaste
rashly

recklessly
full tilt
heedlessly
incontinently

precipitiously
thoughtlessly

Antonyms

carefully

cautiously

Synonyms
adv immediately

rapidly
swiftly
speedily
quickly
directly
hastily
instantly

pronto
fast
flat-out
lickety-split
now
on the double
on time

posthaste
right away
sharp
straightaway
expeditiously
PDQ
at once

fleetly
in nothing flat
like a shot
on the dot
punctually
unhesitatingly

Antonyms

late

negligently

slowly

Synonyms
adj fast, speedy

rapid
energetic
cursory
hasty
agile
brisk
brief
immediate
instantaneous
nimble
sudden
abrupt

hurried
active
expeditious
keen
swift
express
prompt
flying
alert
going
fleet
accelerated

animated
breakneck
curt
double time
headlong
impatient
impetuous
lively
mercurial
on the double
perfunctory
posthaste

pronto
snappy
spirited
sprightly
spry
winged
ASAP
a move on
expeditive
harefooted
move it
the lead out

Antonyms

leisurely
idle
inactive
lazy
sluggish

unhurried
delayed
clumsy
later
ignorant

stupid
uneducated
slow

Synonyms
adv very quickly

swiftly
fast
speedily
immediately
promptly

briskly
flat out
hastily
lickety-split
posthaste

expeditiously
at speed
full tilt
hurriedly
in a hurry

in a rush
in haste
like a shot
precipitately
with dispatch

Antonyms

leisurely

slowly

sluggishly

Synonyms
adv in the near future

rapidly
speedily
promptly
early
directly
shortly
quickly
instantly
presently

anon
betimes
fast
forthwith
hastily
lickety-split
on time
posthaste
pronto

quick
short
any minute now
before long
by and by
coming down the pike
ere long
expeditiously
fleetly

in a little while
in a minute
in a second
in a short time
in due time
in short order
in time

Antonyms

late
later

distant
far

never

Synonyms
adv very fast

apace
flat-out
hastily
posthaste
promptly

quick
quickly
rapidly
speedily
double-quick

expeditiously
fleetly
full tilt
hurriedly
in no time

without losing time
without warning

Antonyms

slowly

sluggishly

Synonyms
adv quickly

speedily

rapidly

posthaste

swiftly

Synonyms
adv very fast

rapidly
speedily
quickly
hastily
promptly

apace
flat-out
hotfoot
posthaste
quick

swift
expeditiously
fleetly
double-quick
full tilt

hurriedly
without warning

Antonyms

slowly

sluggishly