Where does “безкінечний” come from?

безкінечний (Ukrainian) comes from Ukrainian кіне́ць, from Old East Slavic коньць, from Proto-Slavic konьcь, from Proto-Slavic konъ, from Proto-Slavic čęti — to begin.

Ancestry of “безкінечний”, step by step

StepLanguageWordMeaning
1Ukrainianкіне́цьend, termination, conclusion
2Old East Slavicконьцьend; edge, border
3Proto-Slavickonьcьend; thread, string
4Proto-Slavickonъbeginning; end
5Proto-Slavicčętito begin
Every word from Proto-Slavic čęti →Every word from Proto-Slavic konъ →Every word from Proto-Slavic konьcь →