sporan

1. debatable; disputable; contested
   To je sporno pitanje i o njemu ćemo još pričati. — That's a debatable question, and we'll talk about it more.
   Nije sporno da je on najbolji igrač u timu. — There's no question that he's the best player on the team.
2. (in the media) controversial; in question
   Sporni snimak je obišao sve društvene mreže. — The controversial video went viral on all social networks.
   Sudija je poništio sporni gol. — The referee disallowed the disputed goal.

The common formula 'nije sporno da…' means 'it is undisputed that…'.