D. tainted
"Adulterated" means to make something poorer in quality by adding something else, often harmful or undesirable. "Tainted" also conveys a similar meaning of contamination or making something impure.
The pure spring water had become adulterated by runoff from the
factory.
Adulterated is most similar in meaning to
A. filled
B. matured
C.purified
D. tainted
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