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say it: luh-THAHR-jik
lethargic is an adjective meaning "deficient in alertness or activity". It carries one recorded sense.
deficient in alertness or activity
“bullfrogs became lethargic with the first cold nights”
Definitions, synonyms and semantic relations for lethargic come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.