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Related topics:1DN happening or existing in some areas but not in others : 
patchy fog
patchy fog2 not complete enough to be useful : His knowledge of French remained pretty patchy. There is only patchy evidence of the animal's existence.
His knowledge of French remained pretty patchy.There is only patchy evidence of the animal's existence.3 especially British English good in some parts but bad in others : I thought the performance was patchy.
I thought the performance was patchy. —patchiness noun [uncountable]
