lethargy

Is your pet slug always this comatose, or is this display of lethargy unusual? The word lethargy describes inactivity or a lack of energy.

Lethargy comes from the Greek lethargos, originally meaning “inactive through forgetfulness.” Somewhere along the way, the word lost the implication of “forgetfulness” and just ended up hanging around in bed all day. Still, lethargy doesn’t necessarily imply laziness; it can be brought about by illness and may also describe a lack of strength. Other lethargic nouns include torpor, sluggishness, and languor.

Definitions of lethargy
  1. noun
    inactivity; showing an unusual lack of energy
    synonyms: flatness, languor, phlegm, sluggishness
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    type of:
    inactiveness, inactivity, inertia
    a disposition to remain inactive or inert
  2. noun
    weakness characterized by a lack of vitality or energy
    synonyms: inanition, lassitude, slackness
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    type of:
    weakness
    the property of lacking physical or mental strength; liability to failure under pressure or stress or strain
  3. noun
    a state of comatose torpor (as found in sleeping sickness)
    synonyms: lassitude, sluggishness
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    types:
    hebetude
    mental lethargy or dullness
    type of:
    torpidity, torpor
    a state of motor and mental inactivity with a partial suspension of sensibility
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