Where does “cichość” come from?

cichość (Polish) comes from Polish Cichy, from Old Polish cichy, from Proto-Slavic tixъ, from Proto-Balto-Slavic teišus.

Ancestry of “cichość”, step by step

StepLanguageWordMeaning
1PolishCichyquiet, silent
2Old Polishcichycalm, modest, humble
3Proto-Slavictixъstill, quiet
4Proto-Balto-Slavicteišus—
Every word from Proto-Balto-Slavic teišus →Every word from Proto-Slavic tixъ →Every word from Old Polish cichy →