uncontaminated

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. not corrupted by contact or association
- there is no culture uncontaminated by contact with the outside world
• Ant:
contaminated
2. free from admixture with noxious elements;
clean
- unpolluted streams
- a contaminated lake
• Syn:
unpolluted
• Similar to:
pure