Where does “лгунище” come from?

лгунище (Russian) comes from Russian лгун, from Russian лгать, from Proto-Slavic lъgati, from Proto-Balto-Slavic lugtei, from Proto-Indo-European lewgʰ- — to lie, to tell falsehood.

Ancestry of “лгунище”, step by step

StepLanguageWordMeaning
1Russianлгунliar
2Russianлгатьto lie, to tell lies
3Proto-Slaviclъgatito lie
4Proto-Balto-Slaviclugtei—
5Proto-Indo-Europeanlewgʰ-to lie, to tell falsehood
Every word from Proto-Indo-European lewgʰ- →Every word from Proto-Balto-Slavic lugtei →Every word from Proto-Slavic lъgati →