1. Impaired by diminution
   - diminished, lessened, weakened 
2. Ruined in character or quality
   - corrupted, debased

1. Corrupt morally or by intemperance or sensuality
   - corrupt, pervert, subvert, demoralize, demoralise [Brit], debauch, debase, profane, deprave, misdirect 
2. Make imperfect
   - mar, impair, spoil, deflower 
3. Take away the legal force of or render ineffective
   - invalidate, void

See also: corrupt, impaired, vitiation

Type of: alter, change, damage, modify

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