ruth

From Middle English ruthe, reuthe, reuþe, reowthe, rewthe (“compassion, pity, sympathy; mercy; grief, sorrow; cause or event of pity or sorrow; lamentation; calamity, trouble; distress; regret, remorse; cruelty, ill treatment”), from reu, reuen (“to feel compassion or pity; to regret, rue; etc.”) + -th, -the (suffix denoting a condition, quality, state of being, etc.), possibly influenced by an early Scandinavian language (compare Old Norse hrygð, hryggð (“affliction, grief, sorrow, ruth”), from the Proto-Germanic word indicated below).

出典: Wiktionary「ruth」（CC BY-SA 4.0）