mustra

1. (on fabric) pattern
   Kupila je haljinu sa cvetnom mustrom. — She bought a dress with a floral pattern.
2. template; model
   Svi izveštaji se pišu po istoj mustri. — All the reports are written from the same template.
3. colloq. derog. ironic (of a person) a sly one; a schemer; a piece of work
   Ma, i on je neka mustra! — Oh, he's a sly one too!

Of a person, mustra sounds disapproving or teasing: it describes someone sly and crafty.