1. not contaminated or made dirty by harmful substances

Examples

• The mountain lake remained unpolluted despite nearby development.
• Scientists found unpolluted groundwater deep beneath the city.
• The national park protects miles of unpolluted wilderness.
• Fresh, unpolluted air filled our lungs as we hiked higher.
• The remote island has unpolluted beaches and crystal-clear water.
• Farmers rely on unpolluted soil to grow healthy crops.