Disimprove [verb]

● Perish

● Decay

● Disintegrate

● Warp

● Crumble

● Wither

● Spoil

● Molder

● Stain

● Decompose

● Languish

● Decline

● Pervert

● Debase

● Fester

● Worsen

● Debauch

● Taint

● Turn

● Deprave

● Putrefy

● Sink

● Degenerate

● Retrograde

● Corrupt

● Demoralize

● Descend

● Break down

● Go bad

● Go downhill

● Go to pot

● Waste away

● Go up

● Rise

● Strengthen

● Flourish

● Develop

● Build

● Moralize

● Cleanse

● Purify

● Clean

● Upgrade

● Ascend

● Increase

● Put together

● Unite

● Combine

● Improve

● Grow

● Disimprove

● Disimprovement

● Pejorate

● Pejoration

● Disrank

● Worse

● Power failure

● Health problem

● Go to pot

● Deteriorate

● Eat into

● Disrange

● Be sick

● Disennoble

● Rattish

● Disbecome

● Baddish

● Abirritate

● Hinderling

● Wooden leg

● Wear on

● Disgraduate

● Embetter

● Face up to

● Uglily

● Abnormal condition

● Misaffect

● Weak point

● Difform

● Wear away

● Disbase

● Defail

● Diswont

● Labefaction

● Troublesomeness

● Worsen

● Hell to pay

● Poor

● Disinvigorate

● Dilapidator

● Downbear

● Low quality

● Pine away

● Accloy

● Underproportioned

● Abater

● Score off

● Incogitancy

● Unheart

● Distrouble

● Dispurpose

● Exacerbescence

● Unshape

● Disnatured

● Ease up

● Becripple

● Change state

● Problem child

● Bad egg

● Disaccustom

● Imminution

● Unrepair

● Fordone

● Skaddle

● Disanimate

● Witzelsucht

● Catch cold

● Miskeep

● Tetched

● Labefy

● Unshapen

● Damnific

● Hebete

● Come between

● Disinsure

● Misease

● Cancerate

● Miseased

● Die down

● Abirritative

● Shend

● Ugsome

● Gum up

● Cripply

● Wanchancy

● Diminishable

● Overweak

● Bonify

● Impressionless

● Diseconomy

● Emunctory

● Miskindle

● Miseasy

● Disembarrassment

● Misimprove

● Terrible

● Peter out

● Tread on

● Disassimilate

● Disavaunce