naivac

1. naive person; naif
   Nisam naivac, znam šta on hoće. — I'm not naive, I know what he wants.
   Samo naivac bi poverovao u takvu priču. — Only a naive person would believe a story like that.
2. colloq. sucker; dupe
   Prodavci na pijaci odmah prepoznaju naivca. — Market sellers spot a sucker right away.

The feminine form is naivka.