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WordNet-Online 
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| Definitions from the WebLethagyDefinition: Lethagy is a noun that refers to a state of sluggishness, lack of energy, and overall laziness. Sense: 1. Physical and mental fatigue. 2. A lack of motivation or enthusiasm. Usage: 1. Physical lethagy: 
 2. Mental lethagy: 
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| letch letcherous letching letdown letdowns leterally leterme leters lethagy lethal lethal agent lethal arrhythmias lethal charm lethal dose lethal gene lethality lethargic 
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