English Reference

Word

lethargic

Phoneticslethar·gic

US/ɫəˈθɑɹdʒɪk/

UK/lɛθˈɑːdʒɪk/

Definitions

01physically sluggish

B2 · Upper Intermediate

adj. feeling very tired and slow, as if you have no energy to move.

adj. characterised by a lack of physical energy or vitality; sluggish and slow-moving.

“The hot summer weather made everyone feel lethargic and sleepy.”

“After recovering from the flu, he remained lethargic for several weeks, finding even minor physical exertion exhausting.”

Synonyms

sluggishlistlessdrowsy

02mentally indifferent

C1 · Advanced Formal

adj. having no interest or excitement about things that usually matter.

adj. showing a lack of motivation, interest, or enthusiasm; apathetic in nature.

“The company's lethargic response to the problem frustrated many customers.”

“The administration was criticised for its lethargic approach to economic reform, which many argued was stifling national growth.”

Real-World Examples

“A lethargic start to the second half featured Van Hecke ambling out of defence and losing the ball.”
The Guardian 19 Oct 2026
“Elena, who works in hospitality and as an actress in London, says she feels lethargic and "completely unmotivated" during her luteal phase.”
BBC News 3 Aug 2026

Etymology

Learned borrowing from Ancient Greek ληθαργικός (lēthargikós), from λήθαργος (lḗthargos, “forgetful, lethargic”), from λήθη (lḗthē, “a forgetting, forgetfulness”) (from which Lethe (“river in Hades”)) + ἀργός (argós, “not working”). By surface analysis, lethargy + -ic.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Occasional
Level
B2 · Upper Intermediate
Updated

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