protivno

1. (+ dat.) contrary to; against
   Postupio je protivno propisima. — He acted contrary to the regulations.
   Udala se protivno volji roditelja. — She got married against her parents' wishes.
2. formal the opposite; the contrary
   Niko još nije dokazao protivno. — Nobody has proven the contrary yet.

In the sense 'contrary to' it takes the dative: protivno zakonu.