pakost

1. malice; spite
   To je uradio iz čiste pakosti. — He did it out of pure spite.
   U njenim očima se videla pakost. — You could see malice in her eyes.
2. nasty trick; spiteful act
   Komšija nam stalno pravi neke pakosti. — Our neighbour keeps playing nasty tricks on us.

Common in "iz pakosti" (out of spite) and "praviti nekome pakost" (to do something nasty to someone).