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lethargy

leth·ar·gy

lethargy

 
 
pronunciation:
le thr ji
part of speech: noun
definition: a state of having very low energy with drowsiness and apathy; lassitude.
She'd fallen into a lethargy caused by physical pain and depression, and she now spent most of her time in bed.
synonyms:
hebetude, inertia, languor, lassitude, laziness, lifelessness, listlessness, sluggishness, torpor
antonyms:
energy, vigor
similar words:
apathy, idleness, indifference, sloth