40 entries under noun topic. ×

8
decline(stop, deterioration, lessening)
5
decay(development, collapse, growth, down)
5
degeneration
5
deterioration(stop, increase, decay, degeneration)
4
decrease(stop, deterioration)
4
degeneracy(honor, deterioration, decay)
4
descent
4
weakening(stop, deterioration)
3
damage(stop, good, favor, benefit)
3
declension
3
declination
2
degradation
2
destruction(creation, devastation, demolition)
2
diminution
2
hurt(stop, deterioration)
2
loss(stop, help, favor, deterioration)
2
worsening(adjective, stop, deterioration)
1
disadvantage
1
harm(stop, deterioration)
1
corrosion
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APASmart Define. (2015). improvement thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/improvement/thesaurus/antonyms
ChicagoSmart Define. 2015. "improvement thesaurus" https://smartdefine.org/improvement/thesaurus/antonyms (accessed September 29, 2026).
HarvardSmart Define 2015, improvement thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/improvement/thesaurus/antonyms>.
MLASmart Define. "improvement thesaurus" 22 December 2015. Web. 29 September 2026. <https://smartdefine.org/improvement/thesaurus/antonyms>