| 单词 | lassitude | 
| 释义 | las·si·tude   (lăsĭ-td′, -tyd′) n.  A state or feeling of weariness, diminished energy, or listlessness. See Synonyms at  lethargy. [Middle English, from Old French, from Latin lassitūdō, from lassus, weary; see  lē- in the Appendix of Indo-European roots.] | 
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