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persuasive
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plausible
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principled
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promoted
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reasoned
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sane
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satisfying
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seemly
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sensible
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sober
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solid
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substantiated
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suggested
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sure
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admissible(adjective, consideration, able, allowable)
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APASmart Define. (2015). illegitimate thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/illegitimate/thesaurus/antonyms
ChicagoSmart Define. 2015. "illegitimate thesaurus" https://smartdefine.org/illegitimate/thesaurus/antonyms (accessed September 27, 2026).
HarvardSmart Define 2015, illegitimate thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/illegitimate/thesaurus/antonyms>.
MLASmart Define. "illegitimate thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/illegitimate/thesaurus/antonyms>