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dirtily  adv 
a schmutzig
b  (fig)  (=meanly) gemein, schäbig 
(=obscenely) 
schmutzig

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