Where does “sooth” come from?

sooth (Middle English) comes from Old English sōþ, from Proto-West Germanic sanþ, from Proto-Germanic sanþaz, from Proto-Indo-European h₁sónts, from Proto-Indo-European h₁ēs- — to be.

Ancestry of “sooth”, step by step

StepLanguageWordMeaning
1Old Englishsōþtrue, sooth; truth; true, actual, real
2Proto-West Germanicsanþtrue; truth
3Proto-Germanicsanþaztrue, real
4Proto-Indo-Europeanh₁sóntsactive participle of *h₁ésti; being, existence;...
5Proto-Indo-Europeanh₁ēs-to be

Words derived from “sooth”

Every word from Proto-Indo-European h₁ēs- →Every word from Proto-Indo-European h₁sónts →Every word from Proto-Germanic sanþaz →
sooth — Etymology, Origin & Word History | Etymology Explorer