19
worsen(verb, health, stop, drop, quality)
17
deteriorate(verb, health, stop, drop, quality)
12
impair(verb, quality, bad, damage, harm)
11
jeff
10
decline(noun, verb, stop, drop, quality)
10
harm(noun, verb, stop, drop, help)
9
blight(verb, break, fix, bad, damage)
9
injure(verb, stop, drop, help, fix)
9
damage(noun, verb, stop, drop, help)
9
diminish(verb, stop, drop, decline, release)
8
debase(verb, quality, bad, hurt, honor)
8
vitiate(verb, bad, hurt, damage, harm)
7
degrade(verb, health, quality, ruin, raise)
7
deprave(verb, quality, bad, hurt, honor)
7
flaw(verb, bad, hurt, damage, harm)
7
take ill(verb, health, recovery, soundness)
6
mar(verb, bad, hurt, damage, harm)
6
weaken(verb, stop, drop, decline, release)
6
aggravate(verb, help, quality, bad, cause)
6
blemish(verb, bad, hurt, damage, harm)
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APASmart Define. (2016). improve thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/improve/thesaurus/antonyms
ChicagoSmart Define. 2016. "improve thesaurus" https://smartdefine.org/improve/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2016, improve thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/improve/thesaurus/antonyms>.
MLASmart Define. "improve thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/improve/thesaurus/antonyms>