Where does “истово” come from?

истово (Russian) comes from Russian и́стовый, from Russian -о́вый, from Old East Slavic -овъ, from Proto-Slavic -ovъ — of, belonging to.

истово (Russian): fervently, ardently

Definitions

  1. fervently, ardently

Ancestry of “истово”, step by step

StepLanguageWordMeaning
1Russianи́стовыйfervent, ardent
2Russian-о́выйused to form adjectives from nouns, often
3Old East Slavic-овъ—
4Proto-Slavic-ovъof, belonging to
Every word from Proto-Slavic -ovъ →Every word from Russian -о́вый →Every word from Old East Slavic -овъ →