Synonyms|1.6kAntonyms|506|Broader|18Narrower|14Related|1.7k
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aimless
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airy
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all wet(expression, reasonable, sensible)
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ambulatory
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amuse
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anarchistic
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apparent
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arch
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arouse
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astute
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bananas
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bantam
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bass
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bedlam
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bendable
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benign
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berserk
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beyond all reason(expression, idiom, reasonable, sensible)
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beyond reason(expression, reasonable, sensible)
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birdbrained
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APASmart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/antonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/antonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/antonyms>