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APASmart Define. (1970). perking up thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/perking_up/thesaurus/antonyms
ChicagoSmart Define. 1970. "perking up thesaurus" https://smartdefine.org/perking_up/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 1970, perking up thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/perking_up/thesaurus/antonyms>.
MLASmart Define. "perking up thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/perking_up/thesaurus/antonyms>