▪ I.lethe,a.Obs.rare. Also 5 leyth. [Of obscure origin: perh. shortened from lethy, lithy, or from leathwake.] Flexible, supple. c1440Promp. Parv. 302/1 Lethy, or weyke (S. leyth), flexibilis.1530Palsgr. 317/1 Lethe delyver of ones lymmes, souple. ▪ II.lethe obs. form of leath.