Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
lethargically is an adverb meaning "without energy; in a lethargic manner". It carries one recorded sense.
without energy; in a lethargic manner
“he hung around the house lethargically”
Definitions, synonyms and semantic relations for lethargically come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .