bezgrešan

1. (in religion) sinless
   Niko od nas nije bezgrešan. — None of us is without sin.
2. (of a performance, work) flawless; faultless
   Golman je odbranio bezgrešnu utakmicu. — The goalkeeper played a flawless match.
   Bezgrešno je odgovorila na sva pitanja. — She answered all the questions without a single mistake.

The phrase «bezgrešno začeće» denotes the Roman Catholic dogma of the Immaculate Conception of the Virgin Mary, which the Orthodox Church does not accept. In everyday speech it is often used ironically of a pregnancy whose origin nobody explains.