Synonyms|221Antonyms|113|Broader|7Narrower|9Related|230
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faith(noun, optimism)
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festival
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fieriness(calm, peace, indifference)
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fire in belly(expression, idiom, dislike, indifference)
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flout
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get up and go
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glee
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good cheer(expression, doubt)
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good spirits(expression, idiom)
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greenness
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guilelessness
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gusto
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hearten
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high spirits(expression, idiom)
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hilarity
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idealism(depression, doubt)
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impetuosity(inactivity, calmness)
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infect
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ingenuousness
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innocence
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APASmart Define. (2016). pessimism thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/pessimism/thesaurus/antonyms
ChicagoSmart Define. 2016. "pessimism thesaurus" https://smartdefine.org/pessimism/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2016, pessimism thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/pessimism/thesaurus/antonyms>.
MLASmart Define. "pessimism thesaurus" 23 March 2016. Web. 25 September 2026. <https://smartdefine.org/pessimism/thesaurus/antonyms>