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Unschärfe Unschärfe  f fuzziness 
[+von Erinnerung, Vorstellung] 
haziness 
begriffliche Unschärfe  lack of conceptual clarity 

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"Collins German Dictionary, complete & unabridged, 5th edition 2004, © William Collins Sons & Co. Ltd. , 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004"