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APASmart Define. (2013). portentously thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/portentously/thesaurus/synonyms
ChicagoSmart Define. 2013. "portentously thesaurus" https://smartdefine.org/portentously/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2013, portentously thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/portentously/thesaurus/synonyms>.
MLASmart Define. "portentously thesaurus" 19 May 2013. Web. 25 September 2026. <https://smartdefine.org/portentously/thesaurus/synonyms>