In a lethargic manner, without energy, tiredly.(adverb)
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Use "lethargically" in a sentence
"My cats and dogs (all six of them) are responding by lying about lethargically, which is a great opportunity for me to catch some of my ordinarily bouncy critters on digital film."
"As I moved past them lethargically, I began to question my worth in the world."
"On his face, in mild degree, was depicted sensuous pleasure as he lethargically scratched his ribs with his one hand."