Synonyms|88Antonyms|69|Broader|0Narrower|0Related|58
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affirmative
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affirmativeness
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affirming
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affirms
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assert
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asseverate
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assure
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aver
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back(verb, trust, recommend)
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bank on(verb, expression, back, trust, recommend)
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be confident of
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be decided
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be firm
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be resolute
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be resolved
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be satisfied with(verb, back, trust, recommend)
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beassured orconfident
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believe in(verb, expression, phrasal verb, back, trust)
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bold
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certify
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APASmart Define. (2015). be certain thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/be_certain/thesaurus/synonyms
ChicagoSmart Define. 2015. "be certain thesaurus" https://smartdefine.org/be_certain/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, be certain thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/be_certain/thesaurus/synonyms>.
MLASmart Define. "be certain thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/be_certain/thesaurus/synonyms>