Synonyms for Vitiated (same or very similar meaning)
WordNet sense 1 (impaired by diminution):
diminished, lessened, weakenedWordNet sense 2 (diminished in strength, quality, or utility):
impairedWordNet sense 3 (ruined in character or quality):
corrupted, debasedWordNet sense 4 (lacking in integrity):
corruptFrom the ODE community, based on WordNetadd/edit