Where does “tristis” come from?

tristis (Proto-Italic) comes from Proto-Indo-European tristh₂s, from Proto-Indo-European steh₂- — to stand.

Ancestry of “tristis”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeantristh₂sa third party standing, after the two parties to...
2Proto-Indo-Europeansteh₂-to stand
Every word from Proto-Indo-European steh₂- →Every word from Proto-Indo-European tristh₂s →