Definition of unpolluted adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌʌnpəˈluːtɪd//
; NAmE NAmE//ˌʌnpəˈluːtɪd//
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that has not been polluted (= made dirty by harmful substances) the unpolluted air of the mountains Otters need secluded, unpolluted stretches of river with plenty of fish. The air was fresh and unpolluted.
See the Oxford Advanced American Dictionary entry: unpolluted