Synonyms|633Antonyms|195|Broader|12Narrower|11Related|609
22
insanity(noun, illness, balance, foolishness)
13
madness
13
play pool
13
silliness
10
craziness
7
unsoundness(noun, advantage)
6
sickness
5
paranoia
4
ailment
4
disease
4
instability(noun, stability, imbalance, inconstancy)
3
aberration(noun, state, normality)
3
illness
3
infirmity(noun, health, weakness, sickness, perfection)
3
malady
2
complaint
2
condition
2
debility
2
disorder
2
feebleness(strength, robustness)
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APASmart Define. (2015). soundness thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/soundness/thesaurus/antonyms
ChicagoSmart Define. 2015. "soundness thesaurus" https://smartdefine.org/soundness/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, soundness thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/soundness/thesaurus/antonyms>.
MLASmart Define. "soundness thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/soundness/thesaurus/antonyms>