1. corrupted, spoiled, or made faulty or defective
Usage: formal
2. made legally invalid or ineffective
Usage: legal

Examples

• The study’s results were vitiated by poor methodology.
• His argument was vitiated by obvious logical flaws.
• The contract was vitiated due to fraudulent misrepresentation.
• The air quality was vitiated by industrial pollution.
• Her reputation was vitiated by the scandal.
• The evidence was vitiated by improper handling.
• The agreement became vitiated when key terms were violated.