Where does “недоступность” come from?

недоступность (Russian) comes from Russian -ость, from Proto-Slavic -ostь — Used with adjectival stems to form abstract...

недоступность (Russian): inaccessibility; unavailability;...

Definitions

  1. inaccessibility; unavailability;...

Ancestry of “недоступность”, step by step

StepLanguageWordMeaning
1Russian-ость-ness, -ity
2Proto-Slavic-ostьUsed with adjectival stems to form abstract...
Every word from Proto-Slavic -ostь →Every word from Russian -ость →