- Definitions|2
- Thesaurus|2k
- Abbreviations|0
| energetic(adjective, dull, full, forceful) | |
| active(adjective, energetic, fixed, afraid, inoperative) | |
| lively(adjective, dull, energetic) | |
| busy(adjective, energetic) | |
| perky | |
| alert(adjective, dull, energetic, careless, indifferent) | |
| vigorous(adjective, dull, weak, energetic, powerful) | |
| vivacious(adjective, energetic) | |
| animated(adjective, energetic, sluggish) | |
| vital(adjective, energetic, inactive) | |
| business-minded | |
| fresh(adjective, inactive) | |
| flirty | |
| zippy | |
| brisk | |
| strenuous(adjective, energetic, zealous) | |
| curious | |
| fast paced | |
| sprightly | |
| spry(adjective, active, vivacious) |
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| APA | Smart Define. (2016). lethargic thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/lethargic/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "lethargic thesaurus" https://smartdefine.org/lethargic/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, lethargic thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/lethargic/thesaurus/antonyms>. |
| MLA | Smart Define. "lethargic thesaurus" 4 January 2016. Web. 24 September 2026. <https://smartdefine.org/lethargic/thesaurus/antonyms> |