Where does “sunful” come from?

sunful (Middle English) comes from Old English synful, from Old English synn, from Proto-West Germanic sunnju, from Proto-Germanic sunjō, from Proto-Indo-European h₁s-ónt-ih₂, from Proto-Indo-European h₁sónts, from Proto-Indo-European h₁ēs- — to be.

Ancestry of “sunful”, step by step

StepLanguageWordMeaning
1Old Englishsynfulsinful; a sinner
2Old Englishsynnsin
3Proto-West Germanicsunnjuresponsibility; care; concern; worry; anxiety
4Proto-Germanicsunjōtruth, sooth; denial, protest
5Proto-Indo-Europeanh₁s-ónt-ih₂
6Proto-Indo-Europeanh₁sóntsactive participle of *h₁ésti; being, existence;...
7Proto-Indo-Europeanh₁ēs-to be
Every word from Proto-Indo-European h₁ēs-Every word from Proto-Indo-European h₁sóntsEvery word from Proto-Indo-European h₁s-ónt-ih₂