fall away
suffer
disimprove
go to shit
go from bad to worse
exasperating
exacerbating
aggravating
exasperate
aggravate
exacerbate
worsen
confound
tant pis
wusser
deterioratingly
poison
deteriorating
take a turn for the worse
decline
dismalize
worstest
misalter
freefall
below average
compound
horribly
downhill
submediocre
exasperated
worst-case scenario
suboptimal
rub salt in someone's wounds
misreform
distortion
deformation
agudization
disimprovement
godforsaken
kick someone when they are down
so much the worse
oversour
bear the brunt
worrisomely
go through hell
horribile dictu
troubledly
rough end of the pineapple
do more harm than good
go to pieces