weaken (v.)
- abate
- afflict
- aggravate
- allay
- alleviate
- assuage
- attemper
- attenuate
- bate
- beat
- blunt
- break
- bugger
- chasten
- collapse
- constrain
- control
- cramp
- cripple
- crumble
- cut
- damage
- damp
- dampen
- de-emphasize
- de-energize
- deaden
- debilitate
- decline
- dematerialize
- derange
- deteriorate
- devitalize
- dilapidate
- dilute
- diminish
- disable
- disembody
- disenable
- disintegrate
- disorder
- downplay
- drain
- droop
- drop
- dull
- dwindle
- ease
- emaciate
- emasculate
- embitter
- enervate
- enfeeble
- etherealize
- eviscerate
- exacerbate
- exhaust
- extenuate
- fade
- fag
- fail
- faint
- fatigue
- flag
- frazzle
- hamstring
- harass
- harm
- honeycomb
- hospitalize
- hurt
- impair
- inactivate
- incapacitate
- indispose
- injure
- invalid
- irritate
- jade
- kibosh
- lame
- languish
- lay
- lenify
- lessen
- lighten
- maim
- minimize
- mitigate
- moderate
- modulate
- obtund
- overfatigue
- overstrain
- overthrow
- overtire
- overturn
- overweary
- palliate
- paralyze
- peak
- pine
- prostrate
- put
- queer
- rarefy
- rattle
- reduce
- remit
- repress
- restrain
- sabotage
- sap
- shake
- shrink
- sicken
- sink
- slacken
- smother
- sober
- soften
- spike
- spiritualize
- stifle
- subdue
- subtilize
- subvert
- suppress
- tame
- temper
- thin
- tire
- tucker
- turn
- unbrace
- undermine
- underplay
- unfit
- unman
- unnerve
- unstring
- upend
- upset
- wane
- waste
- water
- wear
- weary
- wilt
- wind
- wing
- wither
- worsen
- wreck
- yield