出典:Wiktionary
From Middle English ethe (“easy”), from 古期英語 īeþe, from Proto-Germanic *auþuz, from Proto-Indo-European *h₂éwtus (“empty, lonely”), from Proto-Indo-European *h₂ew-. Cognate with Scots eith (“easy”), Old Saxon ōþi (“deserted, empty”), Old High German ōdi (“empty, abandoned, easy, effortless”), Middle High German öde (“blank, vacant, easy”) (German öde), Old Norse auðr (“deserted, empty”), Icelandic auð (“easy”), Gothic (auþeis, “desolate, deserted”). More at easy.
eath (comparative eather, superlative eathest)