lethargic.

Slow and inactive because of a pronounced lack of energy or alertness.

Use it for

Words that belong together

• lethargic response
• lethargic movement

On the page

The heat left the crew lethargic by midday.

Usage notes

Primary category: psychology / human behavior. Forms: Comparative more lethargic; superlative most lethargic when comparison is meaningful. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: character, behavior. Commonness: moderately common.