1. Mixed with impurities
   - adulterate, adulterated 
2. Lowered in value
   "a debased currency"
   - devalued, degraded 
3. Ruined in character or quality
   - corrupted, vitiated

1. Corrupt morally or by intemperance or sensuality
   - corrupt, pervert, subvert, demoralize, demoralise [Brit], debauch, profane, vitiate, deprave, misdirect 
2. Lower in value by increasing the base-metal content
   - alloy 
3. Corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones
   - load, adulterate, stretch, dilute

See also: corrupt, debasement, debaser, impure, low

Type of: alter, change, corrupt, devalue, modify, spoil

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