Antonyms of verb contaminate

1 of 2 senses of contaminate

Sense 2
contaminate -- (make radioactive by adding radioactive material; "Don't drink the water--it's contaminated")
       Antonym of decontaminate (Sense 1)
      => decontaminate -- (rid of contamination; "The soil around the housing development had to be decontaminated by the city")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb contaminate

2 senses of contaminate

Sense 1
pollute, foul, contaminate -- (make impure; "The industrial wastes polluted the lake")
       => dirty, soil, begrime, grime, colly, bemire -- (make soiled, filthy, or dirty; "don't soil your clothes when you play outside!")

Sense 2
contaminate -- (make radioactive by adding radioactive material; "Don't drink the water--it's contaminated")
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")