| lethal | (adjective) of an instrument of certain death | Synonyms: deadly |
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| lethality | (noun) the quality of being deadly | Synonyms: deadliness |
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| lethargic | (adjective) deficient in alertness or activity | Synonyms: unenergetic |
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| lethargically | (adverb) without energy; in a lethargic manner | Synonyms: unenergetically |
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| lethargy | (noun) weakness characterized by a lack of vitality or energy | Synonyms: inanition, lassitude, slackness |
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| (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, languor, phlegm, sluggishness |
| (noun) a state of comatose torpor (as found in sleeping sickness) | Synonyms: lassitude, sluggishness |