Synonyms|28Antonyms|0|Broader|0Narrower|0Related|0
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promise
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really
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seriously
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take an oath
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testify(verb, vouch)
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truly
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undertake
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warrant
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APASmart Define. (2011). cross one's heart thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/cross_one%27s_heart/thesaurus/synonyms
ChicagoSmart Define. 2011. "cross one's heart thesaurus" https://smartdefine.org/cross_one%27s_heart/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2011, cross one's heart thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/cross_one%27s_heart/thesaurus/synonyms>.
MLASmart Define. "cross one's heart thesaurus" 29 May 2011. Web. 30 September 2026. <https://smartdefine.org/cross_one%27s_heart/thesaurus/synonyms>