neženja

1. bachelor
   Moj brat je još uvek neženja. — My brother is still a bachelor.
   On je večiti neženja i ne planira da se ženi. — He's a confirmed bachelor and has no plans to marry.

It declines like feminine nouns in -a, but singular adjectives agree in the masculine: stari neženja. In the plural, feminine agreement is also possible: stare neženje.