| lethargy | <symptom> Abnormal drowsiness or stupor, a condition of indifference. Origin: Gr. Lethargia = drowsiness (18 Nov 1997) |
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| lucid | Clear, not obscured or confused, as in a lucid moment or lucid spoken expression. Origin: L. Lucidus, clear (05 Mar 2000) |
| lucid interval | In psychoses or delirium, a rational period appearing in the course of the mental disorder. (05 Mar 2000) |