inteligentan

1. (of a person, animal) intelligent; smart
   Ona je veoma inteligentna i vredna devojka. — She's a very intelligent and hard-working girl.
   Psi ove rase su izuzetno inteligentni. — Dogs of this breed are extremely intelligent.
2. (of a thing, idea) clever; intelligent
   To je bilo vrlo inteligentno pitanje. — That was a very intelligent question.

Means “clever”, not “cultured, well-mannered” as Russian «интеллигентный» can.