Where does “bleth” come from?

bleth (Middle English) comes from Old English blēaþ, from Proto-Germanic blauþuz, from Proto-Indo-European mlew-.

Ancestry of “bleth”, step by step

StepLanguageWordMeaning
1Old Englishblēaþgentle, timid, peaceful, inactive; gentle, shy,...
2Proto-Germanicblauþuzweak, feeble, emaciated; lacking, void, naked;...
3Proto-Indo-Europeanmlew-—
Every word from Proto-Indo-European mlew- →Every word from Proto-Germanic blauþuz →Every word from Old English blēaþ →