| decline(noun, stop, deterioration, lessening) | |
| decay(noun, development, collapse, growth, down) | |
| degeneration | |
| deterioration(noun, stop, increase, decay, degeneration) | |
| downgrade(verb, rise) | |
| decrease(noun, stop, deterioration) | |
| degeneracy(noun, honor, deterioration, decay) | |
| descent(noun, deterioration) | |
| weakening(noun, stop, deterioration) | |
| damage(noun, stop, good, favor, benefit) | |
| declension | |
| declination | |
| impairment | |
| degradation(noun, increase) | |
| destruction(noun, creation, devastation, demolition) | |
| diminution(noun, growth) | |
| drop(increase, lot) | |
| hurt(noun, stop, deterioration) | |
| lapse | |
| loss(noun, stop, help, favor, deterioration) |
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| APA | Smart Define. (2015). improvement thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/improvement/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "improvement thesaurus" https://smartdefine.org/improvement/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, improvement thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/improvement/thesaurus/antonyms>. |
| MLA | Smart Define. "improvement thesaurus" 22 December 2015. Web. 24 September 2026. <https://smartdefine.org/improvement/thesaurus/antonyms> |