sublumic
subluminal
subluminary
sub-light
subluminally
superluminal
slow-motion
superluminary
hyperlight
superlumic
decelerate
tachyonic
nonrelativistic mechanics
underspeed
allegro moderato
underdrive
nonrelativistic
douse
lightspeed
slacken
slow down
slow
slack
slow up
retardation
luminal
pokey
brady-
faster-than-light
outbrake
lumic
slower
downtempo
superlight
slowth
superluminally
steady
deaden
low
slowly
poky
deceleration
behind
meno mosso
fleet
decelerated motion
belatedness
speedless
relativistic
subsonic
slowish
slowness
supercee
lento
low-octane
fading away
easy
time dilation
sluggish
overslow
tardily
larghissimo
tardyon
fadingly
andante
allargando
andantino
subrelativistic
lazily
double time
slowdown
overnight
dozy
crawl
shimmer
double quick
play
snail's pace
under
fastener
speedlessness
glacial
larghetto
short of
slow as tar
jump
slowass
dog slow
unclockable
ultrasoft
expressness
sublumic
subluminal
subluminary
sub-light
superluminal
slow-motion
superluminary
hyperlight
superlumic
tachyonic
underdrive
nonrelativistic
luminal
slow
pokey
faster-than-light
lumic
superlight
steady
low
poky
behind
fleet
speedless
relativistic
subsonic
slowish
lento
low-octane
sluggish
overslow
subrelativistic
dozy
glacial
larghetto
slow as tar
slowass
dog slow
unclockable
ultrasoft
downtempo
subluminally
allegro moderato
downtempo
superluminally
slowly
slow
easy
tardily
fadingly
andante
allargando
andantino
lazily
double time
overnight
double quick
nonrelativistic mechanics
underspeed
lightspeed
retardation
slower
slowth
deceleration
meno mosso
decelerated motion
belatedness
slowness
supercee
fading away
time dilation
larghissimo
tardyon
slowdown
crawl
shimmer
play
snail's pace
fastener
speedlessness
jump
subsonic
expressness
decelerate
douse
slacken
slow down
slow
slack
slow up
outbrake
deaden
English words for 'slower than light; having a speed less than that of light.'
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