Emily Dickinson Lexicon

LETH'AR-GY, n. [L. lethargia; Gr. ληθαργια; ληθη, oblivion, and αργος, idle.]

1. Preternatural sleepiness; morbid drowsiness; continued or profound sleep, from which a person can scarcely be awaked.
2. Dullness; inaction; inattention. Europe lay then under a deep lethargy. – Atterbury.