Where does “tanizna” come from?

tanizna (Polish) comes from Polish tani, from Old Polish tuni, from Proto-Slavic *tuňь — futile, vain, idle.

Ancestry of “tanizna”, step by step

StepLanguageWordMeaning
1Polishtanicheap
2Old Polishtuni—
3Proto-Slavic*tuňьfutile, vain, idle
Every word from Proto-Slavic *tuňь →Every word from Old Polish tuni →Every word from Polish tani →