vitiates
Makes legally invalid
Vitiates means impairs, weakens, or renders something ineffective.
A contract may be vitiated by fraud.
Evidence can be vitiated by improper handling.
The word carries a formal, often legal tone: The procedural errors vitiate the entire proceeding.
More broadly, to vitiate is to corrupt or debase: Constant compromise vitiates one's principles.
Makes slightly impure
- contaminatesMakes unclean or impure
- pollutesIntroduces harmful substances
- adulteratesCorrupts by adding impurities
- defilesContaminates or desecrates
debase · perverts · poisons · infects · spoils · fouls · sullies · besmirches
Lessens effectiveness or strength
- diminishesBecomes smaller or weaker
- underminesWeakens by stealth
- sapsErodes vitality slowly
- enfeeblesMakes weak or feeble
debilitates · attenuates · erodes · degrades · deteriorates · lessens · reduces · dilutes
taints
Makes slightly impure
- contaminatesMakes unclean or impure
- pollutesIntroduces harmful substances
- adulteratesCorrupts by adding impurities
defiles · debase · perverts · poisons · infects · spoils · fouls · sullies · besmirches · stains
impairs
Lessens effectiveness or strength
- diminishesBecomes smaller or weaker
- underminesWeakens by stealth
- sapsErodes vitality slowly
enfeebles · debilitates · attenuates · erodes · degrades · deteriorates · lessens · reduces · dilutes · enervates
nullifies
Makes of no effect
rescinds · revokes · negates · overturns · quashes · vacates · countermands · cancels · repeals · abolishes
vitiatesvalidates
Confirms accuracy or legitimacy
upholds · confirms · ratifies · affirms · substantiates
vitiatesstrengthens
Increases force or durability
reinforces · bolsters · fortifies · supports · aids