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concave
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contracting
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decreasing
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deflating
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dented
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depressed
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dished
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flattening
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hollow
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recessed
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sunken
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APASmart Define. (2015). ballooning thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/ballooning/thesaurus/antonyms
ChicagoSmart Define. 2015. "ballooning thesaurus" https://smartdefine.org/ballooning/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, ballooning thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/ballooning/thesaurus/antonyms>.
MLASmart Define. "ballooning thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/ballooning/thesaurus/antonyms>