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clear(adjective, certain, definite, positive, confident)
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closely
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conclusive(certain, unquestionable, undisputable)
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constant(adjective, clear, certain, definite, unquestionable)
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curiously(unmistakably, drastically, prohibitively)
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decided(adjective, clear, certain, definite, unquestionable)
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definite(adjective, clear, certain, sure, unquestionable)
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drastically(unmistakably, prohibitively)
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endorsed(adjective, certain, definite, sure, assured)
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enduring(adjective, clear, certain, definite, unquestionable)
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enormously(unmistakably, drastically, prohibitively)
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exceedingly(unmistakably, drastically, prohibitively)
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exorbitantly(unmistakably, drastically, prohibitively)
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extremely(unmistakably, drastically, prohibitively)
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firm(adjective, clear, certain, definite, unquestionable)
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fixed(adjective, clear, certain, definite, unquestionable)
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for real(expression, adverb, really, positively, definitely)
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highly(unmistakably, drastically, terrifically, prohibitively, unequivocally)
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historical
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hugely(unmistakably, drastically, terrifically, prohibitively, unequivocally)
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APASmart Define. (2015). for a fact thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/for_a_fact/thesaurus/synonyms
ChicagoSmart Define. 2015. "for a fact thesaurus" https://smartdefine.org/for_a_fact/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, for a fact thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/for_a_fact/thesaurus/synonyms>.
MLASmart Define. "for a fact thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/for_a_fact/thesaurus/synonyms>