regress
retrograde
retrogress
decline
sludge
go backwards
pejorate
back-ganging
suffer
fall away
weaken
below average
lose ground
drop behind
plumb
retrogressive
Mongolian idiocy
worsened
worse
worsener
go downhill
exacerbating
worsening
disimprove
exasperating
spit up
aggravating
get worse
comedown
out of the frying pan, into the fire
relapse
nerfed
submediocre
downhill
revert
rub salt in the wound
poison
descent
slumpy
subside
soothe
recurrence
deteriorate
misrectify
flare
worsen
weakening
exacerbate
aggravate
deteriorating
downfall
delapsion
exasperate
for the worse
downslide
go from bad to worse
decrudescence
decay
degeneration
turn
seamed
miscompensate
impair
take a turn for the worse
run
ratty
aggravation
exacerbation
shot
broken
backslide
chronification
anesis
lucid interval
off time
go to seed
do more harm than good
far gone
rot
intersymptom
waste
suck
sink
confound
tilt
slump
lapse
dust
baddish