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(chiefly poetic, Greek mythology) Of or relating to the river Lethe, one of the four rivers of Hades. Those who drank from it experienced complete forgetfulness. quotations
They ferry over this Lethean sound.
1667, Milton, Paradise Lost
The cup which was offered to you when you departed from Elysium was to be the Lethean draught, which would make you forget the joys you had experienced[.]
1813, Thomas Jefferson Hogg, The Memoirs of Prince Alexy Haimatoff, London: T. Hookham, jun., and E.T. Hookham, page 99
Accordingly, she one day took the Lethean crown from off his head: immediately all his old ideas rushed on his mind, and inflamed him with an ardent desire to revisit his country.
1828, Thomas Keightley, The Fairy Mythology, volume I, London: William Harrison Ainsworth, page 80