unenergetically
Adverb
Meaning
without energy; in a lethargic manner
Source: WordNetSynonyms
lethargically
hard
faintly
indifferently
indolently
vigorously
apathetically
languidly
effortlessly
lackadaisically
lifelessly
lukewarmly
inactively
inertly
languorously
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Antonyms
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he hung around the house lethargically