nepoznanica

1. unknown; mystery
   Budućnost projekta je i dalje velika nepoznanica. — The future of the project is still a big unknown.
   Cena karata za sada je nepoznanica. — The ticket price is still unknown for now.
2. (of a person) unknown quantity; unknown person
   Novi trener je za navijače potpuna nepoznanica. — The new coach is a complete unknown to the fans.
3. (in mathematics) unknown; unknown quantity
   Ova jednačina ima dve nepoznanice. — This equation has two unknowns.