Lethean

They ferry over this Lethean sound.

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[.]

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.

Men said that the garden had been roofed over against the sun with great sheets of lead and copper, leaving no cranny through which the tiniest star could peer down. Some swore that the privacy of its masters during their visits was ensured by a lethean slumber which Dwerulas, through his magic art, was wont to lay at such times upon the whole vicinity.