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Schelm  m , -(e)s, -e 
dated  (=Spaßvogel) joker, wag dated  
obs  (=Gauner) knave  (Brit) obs , scoundrel, (Liter) picaro 
den Schelm im Nacken haben  to be up to mischief 
ein Schelm, der Böses dabei denkt   (prov)  honi soit qui mal y pense  (prov) , evil to him who evil thinks  (prov)  

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