mental lethargy

USAGE SUMMARY

"mental lethargy" is correct and usable in written English.
You can use this phrase when you want to refer to a state of being mentally or physically slow or sluggish. For example: "After a long day of studying, I felt a sense of mental lethargy threatening to take over my body."

✓ Grammatically correct

Science

News & Media

Human-verified examples from authoritative sources

Exact Expressions

3 human-written examples

Then he fell to thinking that all over the third world (as it was then called) people were just sitting, staring into space, doing nothing, sinking deeper into mental lethargy.

The New York Times

His powers of reason, though thus warped, were not taken from him, and he neither raved nor sank into mental lethargy.

Wikipedia

This condition was associated with hepatosplenomegaly, hypogonadism, rough and dry skin, mental lethargy and genophagia (clay eating), and was initially misdiagnosed as iron-deficiency anaemia.

Bioscience Reports

Human-verified similar examples from authoritative sources

Similar Expressions

57 human-written examples

Symptoms that occur within minutes to several hours after exposure may involve lesions of the skin and mouth; difficulty breathing; a precipitous drop in blood pressure, dizziness or rapid heart rate; abdominal pain, vomiting or diarrhea; and anxiety, mental confusion, lethargy or seizures.

The New York Times - Health

Change in mental status (lethargy, disorientation, increased or new onset of confusion and delirium) was the most commonly reported symptom for suspecting UTI [ 20].

BMC Family Practice

Parents were told to take their children to a doctor if they showed symptoms including fever, stiff neck, mental confusion, vomiting, lethargy or headache.

The New York Times

At the same time, in the continuous light group, all rats showed a poor mental state, exhibiting lethargy and decreased activity).

BioMed Research International

Acute Renal Failure (ARF) was defined as rise of creatinine (Cr) >3 times of normal [ 22]; c) Encephalopathy was defined as altered mental status (drowsiness, lethargy, agitation, or coma) for ≥ 8 hours [ 23]; d) Shock was defined as systolic pressure < 90 mm Hg [ 24]; e) Acalculous cholecystitis was defined as inflammation of gall bladder without stone on ultrasound[ 2].

BMC Gastroenterology

Know the symptoms of dehydration: headache, lethargy, dizziness, mental fuzziness and loss of appetite.

The New York Times - Health

Patients who had manifestations of altered mental status (drowsiness, spasm, lethargy, agitation, or coma) were defined as having encephalopathy.

BMC Infectious Diseases

The 6 items selected assessed the following delirium symptoms: easily distracted, periods of altered perception, disorganized speech, periods of restlessness, periods of lethargy and mental function that varies over the course of the day.

BMC Nursing

Expert writing Tips

Best practice

When using "mental lethargy", ensure the context clearly indicates a state of reduced mental activity, not physical fatigue alone. It's most effective when describing cognitive slowdown, lack of focus, or impaired mental processing.

Common error

Avoid using "mental lethargy" interchangeably with simple tiredness. While fatigue can contribute, lethargy specifically implies a cognitive slowdown, impacting mental clarity and processing speed, rather than just feeling weary.

Linguistic Context

The phrase "mental lethargy" functions primarily as a noun phrase. It typically acts as a subject, object, or complement within a sentence, denoting a state or condition. Ludwig AI confirms its usability in written English, indicating its grammatical correctness.

Expression frequency: Rare

Frequent in

Science

60%

News & Media

30%

Formal & Business

10%

Less common in

Encyclopedias

0%

Wiki

0%

Social Media

0%

Ludwig's WRAP-UP

"Mental lethargy" is a noun phrase used to describe a state of reduced mental activity and alertness. Ludwig AI confirms its grammatical correctness and usability. While not a highly frequent term, its use is appropriate in both scientific and general contexts. Synonyms include "cognitive sluggishness" and "mental sluggishness". It's important to use the phrase accurately, distinguishing it from simple tiredness or fatigue by emphasizing the cognitive slowdown it implies. The term is most often found in scientific and news media sources, suggesting a neutral to formal register.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

mental sluggishness

Similar to the original phrase but emphasizes slowness.

cognitive fatigue

Highlights mental exhaustion affecting cognitive functions.

cognitive sluggishness

Emphasizes the slowness of cognitive processes.

reduced cognitive function

A more clinical and formal way to describe impaired mental processes.

lack of mental sharpness

Focuses on the absence of acuity and clarity in thought.

decreased mental acuity

Highlights the reduction in sharpness and quickness of thought.

intellectual inactivity

Highlights the state of being idle in terms of intellectual pursuits.

loss of mental energy

Emphasizes the depletion of mental resources.

brain fog

A more informal term describing a state of confusion and reduced mental clarity.

state of apathy

Focuses on a lack of interest and motivation.

FAQs

How can I use "mental lethargy" in a sentence?

You can use "mental lethargy" to describe a state of decreased mental alertness or activity. For example, "After a sleepless night, I experienced significant mental lethargy" or "The illness caused a noticeable mental lethargy, making it difficult to concentrate".

What's the difference between "mental lethargy" and "mental fatigue"?

"Mental lethargy" implies a slowness and reduced energy in mental processes, while "mental fatigue" suggests exhaustion after prolonged mental effort. Lethargy indicates a general lack of activity, while fatigue indicates depletion.

What are some synonyms for "mental lethargy"?

Synonyms for "mental lethargy" include "cognitive sluggishness", "mental sluggishness", and "lack of mental sharpness". These phrases all describe a state of reduced mental activity or alertness.

What causes "mental lethargy"?

"Mental lethargy" can be caused by various factors, including sleep deprivation, illness, medication side effects, poor diet, or underlying medical conditions. Addressing these causes can help alleviate the lethargy.