Where does “безотказный” come from?

безотказный (Russian) comes from Russian -ный, from Old Church Slavonic -ьнъ, from Proto-Slavic -ьnъ — -ish, -ic, -al, -ed; From adjectives.

безотказный (Russian): reliable, faultless, trouble-free, dependable;...

Definitions

  1. reliable, faultless, trouble-free, dependable;...

Ancestry of “безотказный”, step by step

StepLanguageWordMeaning
1Russian-ный-ish, -ic, -al, -ed
2Old Church Slavonic-ьнъish, -ic, -al, -ed
3Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives
Every word from Proto-Slavic -ьnъ →Every word from Russian -ный →Every word from Old Church Slavonic -ьнъ →
безотказный — Etymology, Origin & Word History | Etymology Explorer