63 entries under certainly topic. ×

11
unconditionally(adverb, absolutely, completely, exactly, positively)
10
of course(expression, idiom, adverb, interjection, absolutely)
8
yes(adverb, interjection, just, absolutely, exactly)
8
distinctly(adverb, absolutely, positively, precisely)
8
unmistakably(adverb, absolutely, positively, easily)
7
doubtlessly(adverb, absolutely, really, exactly)
7
indeed(adverb, absolutely, really, clearly)
6
unambiguously(adverb, absolutely, exactly, positively)
6
very(adverb, absolutely, really, exactly)
5
beyond doubt(expression, adverb, absolutely, positively)
5
indisputably(adverb, positively)
4
actually(adverb, absolutely, really, exactly, positively)
4
all right(expression, adverb, interjection, positively)
4
beyond question(expression, adverb, absolutely, really, exactly)
4
genuinely(adverb, absolutely, really, exactly)
4
honestly(adverb, absolutely, really, exactly)
4
incontestably
4
veritably(adverb, absolutely, very, really, exactly)
3
factually(adverb, absolutely, very, really, exactly)
3
incontrovertibly
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APASmart Define. (2016). definitely thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/definitely/thesaurus/synonyms
ChicagoSmart Define. 2016. "definitely thesaurus" https://smartdefine.org/definitely/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, definitely thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/definitely/thesaurus/synonyms>.
MLASmart Define. "definitely thesaurus" 18 February 2016. Web. 20 September 2026. <https://smartdefine.org/definitely/thesaurus/synonyms>