osrednji

1. (of quality) mediocre; average
   Film je bio osrednji, ništa posebno. — The film was mediocre, nothing special.
   U školi je bio osrednji učenik. — He was an average student at school.
2. (of size, amount) medium; moderate
   Tražimo stan osrednje veličine u centru. — We're looking for a medium-sized flat in the centre.