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Synonyms for Vitiated (same or very similar meaning)

WordNet sense 1 (impaired by diminution):
diminished, lessened, weakened

WordNet sense 2 (diminished in strength, quality, or utility):
impaired

WordNet sense 3 (ruined in character or quality):
corrupted, debased

WordNet sense 4 (lacking in integrity):
corrupt


From the ODE community, based on WordNetadd/edit