Where does “твердолобый” come from?

твердолобый (Russian) comes from Russian твёрдый, from Old East Slavic твьрдъ, from Proto-Slavic tvьrdъ, from Proto-Balto-Slavic *twírˀtas, from Proto-Indo-European twerH- — to enclose, fence in; to grab, seize; to stir.

твердолобый (Russian): thick-headed

Definitions

  1. thick-headed

Ancestry of “твердолобый”, step by step

твердолобый traces back through two separate lines of ancestry.

via Russian твёрдый

StepLanguageWordMeaning
1Russianтвёрдыйhard, solid; firm; steadfast, steady
2Old East Slavicтвьрдъ—
3Proto-Slavictvьrdъhard, firm, solid
4Proto-Balto-Slavic*twírˀtashard, firm, solid
5Proto-Indo-EuropeantwerH-to enclose, fence in; to grab, seize; to stir

via Russian лоб

StepLanguageWordMeaning
1Russianлобforehead
2Proto-Slaviclъbъskull
3Proto-Indo-Europeanlubʰo—
Every word from Proto-Indo-European twerH- →Every word from Proto-Balto-Slavic *twírˀtas →Every word from Proto-Slavic tvьrdъ →