Synonyms in Detail: fatigue and lethargy Usage & Differences

What context can I use each word in?

Learn when and how to use these words with these examples!

fatigue

Example

After running a marathon, I was overcome with fatigue. [fatigue: noun]

Example

She felt fatigued after working long hours without a break. [fatigued: adjective]

lethargy

Example

I couldn't shake off the lethargy even after drinking coffee. [lethargy: noun]

Example

The medication made him feel lethargic and unmotivated. [lethargic: adjective]

Good things to know

Which word is more common?

Fatigue is more commonly used than lethargy in everyday language, especially in medical contexts. Fatigue is a more serious condition that requires medical attention, while lethargy is often used to describe a temporary feeling of tiredness or laziness.

What’s the difference in the tone of formality between fatigue and lethargy?

Fatigue is a more formal word than lethargy, often used in medical or scientific contexts. Lethargy is a more casual word that can be used in everyday conversation.

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