To form abstraction noun from an adjective use suffix:
+ost +ост
The formed noun has feminine gender.
mlad+ / млад+ (young)
mladost / младост (youth)
велик+ / velik+ (great)
великост / velikost (greatness)
tvrd+ / тврд+ (hard)
tvrdost / тврдост (hardness)
star+ / стар+ (hard)
starost / старост (oldness)
Anna ima veliku popularnost / Aннa имa велику пoпулaрнoст
(Anna has great popularity)
Grač potvrdzuje svoju velikost / Грaч пoтврдзує свoю великoст
(Player confirms own greatness)
Other cases and plural just ends with -i suffix:
V čase mojej mladosti (At the time of of my youth)
Ideme dnes do našej velikosti (We go today to our greatness)
Ona govori o bezpečnosti školy. (She speaks about safety of the school)
Niekoliko slučajnosti tvori logičnu petľu (Few coincidences create logical loop)
Nastupna strana: Gerund