Synonyms of lethargy

lethargy

noun

ˈle-thər-jē 

as in boredom

physical or mental inertness

the doctor suspected that the patient's depression and lethargy were a result of seasonal affective disorder

Synonyms & Similar Words

• boredom
• stupor
• lassitude
• torpor
• languor
• fatigue
• listlessness
• indifference
• laziness
• malaise
• sleepiness
• hebetude
• inaction
• narcosis
• idleness

Antonyms & Near Antonyms

• vigor
• vitality
• vivacity
• enthusiasm
• eagerness
• ambition
• vim
• enterprise
• spiritedness
• keenness

Synonym Chooser

How does the noun lethargy contrast with its synonyms?

Some common synonyms of lethargy are languor, lassitude, stupor, and torpor. While all these words mean "physical or mental inertness," lethargy implies such drowsiness or aversion to activity as is induced by disease, injury, or drugs.

months of lethargy followed my accident

When would languor be a good substitute for lethargy?

The words languor and lethargy are synonyms, but do differ in nuance. Specifically, languor suggests inertia induced by an enervating climate or illness or love.

languor induced by a tropical vacation

When is lassitude a more appropriate choice than lethargy?

The words lassitude and lethargy can be used in similar contexts, but lassitude stresses listlessness or indifference resulting from fatigue or poor health.

a depression marked by lassitude

Where would stupor be a reasonable alternative to lethargy?

Although the words stupor and lethargy have much in common, stupor implies a deadening of the mind and senses by shock, narcotics, or intoxicants.

lapsed into an alcoholic stupor

When is it sensible to use torpor instead of lethargy?

The meanings of torpor and lethargy largely overlap; however, torpor implies a state of suspended animation as of hibernating animals but may suggest merely extreme sluggishness.

a once alert mind now in a torpor

Example Sentences

Recent Examples of lethargy

Lastly, Harford County Animal Control urges residents to notify them at 410-638-3505 if anyone observes a stray animal showing signs of excessive affection, aggression, lethargy, or disorientation. — Michelle Richardson, CBS News, 24 Aug. 2026

Perhaps the jump scares here also helped shake the filmmakers out of their lethargy in post-production. — Ryan Lattanzio, IndieWire, 19 Aug. 2026

But his parents brought him back two days later, this time with fever, lethargy, a headache, and trouble swallowing. — Beth Mole, ArsTechnica, 12 Aug. 2026

Contact your veterinarian even if your pet appears healthy, and seek emergency care for symptoms such as vomiting, diarrhea, lethargy or appetite loss. — Lauren Paige Richeson, USA Today, 27 July 2026