Where does “tenebrous” come from?

tenebrous (Anglo-Norman) comes from Latin tenebrōsus, from Latin tenebrae, from Proto-Italic temazros, from Proto-Indo-European temH-(e)s-ro-, from Proto-Indo-European temH- — dark.

Ancestry of “tenebrous”, step by step

StepLanguageWordMeaning
1Latintenebrōsusdark, gloomy
2Latintenebraedarkness, especially the darkness of night;...
3Proto-Italictemazrosdark
4Proto-Indo-EuropeantemH-(e)s-ro-
5Proto-Indo-EuropeantemH-dark

Words derived from “tenebrous

Every word from Proto-Indo-European temH-Every word from Proto-Indo-European temH-(e)s-ro-Every word from Proto-Italic temazros