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deftly
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movingly
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operatively
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potently
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responsibly
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runningly
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APASmart Define. (2015). fecklessly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/fecklessly/thesaurus/antonyms
ChicagoSmart Define. 2015. "fecklessly thesaurus" https://smartdefine.org/fecklessly/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2015, fecklessly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/fecklessly/thesaurus/antonyms>.
MLASmart Define. "fecklessly thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/fecklessly/thesaurus/antonyms>