Leth″ar‐gy (–jy̆), n.; pl.-gies (–jĭz). [F. léthargie, L. lethargia, Gr. ληθαργία, fr. λήθαργοσ forgetful, fr. λήθη forgetfulness. See Lethe.] 1. Morbid drowsiness; continued or profound sleep, from which a person can scarcely be awaked.
2. A state of inaction or indifference.
Europe lay then under a deep lethargy. Atterbury.