25 entries under definitely topic. ×

44
surely(adverb, good, fine, absolutely, easily)
36
absolutely(adverb, interjection, certain, limited, well)
31
positively(adverb, interjection, certain, limited, absolutely)
27
indubitably(adverb, interjection, absolutely, easily, clearly)
27
unquestionably(adverb, doubt, absolutely, assent, easily)
26
undoubtedly(adverb, certain, limited, absolutely, positively)
16
doubtless(adjective, adverb, certain, limited, certainty)
16
clearly(adverb, absolutely, really, positively)
16
undeniably(adverb, absolutely, very, positively, easily)
12
categorically(adverb, well, absolutely, exactly, easily)
12
really(adverb, truth, absolutely, very, exactly)
11
for sure(expression, idiom, adverb, sure, exactly)
9
for certain(expression, idiom, adverb, certainty, absolutely)
7
exactly(adverb, interjection, assent, really, positively)
5
completely(adverb, absolutely, positively, rightly)
4
decisively(adverb, really, completely, exactly, positively)
4
inevitably(adverb, absolutely, clearly, plainly)
3
amen(interjection, good, fine, absolutely, very)
3
downright(adverb, absolutely, really, positively, clearly)
3
inescapably(adverb, completely, seriously, naturally)
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APASmart Define. (2016). certainly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/certainly/thesaurus/synonyms
ChicagoSmart Define. 2016. "certainly thesaurus" https://smartdefine.org/certainly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, certainly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/certainly/thesaurus/synonyms>.
MLASmart Define. "certainly thesaurus" 30 March 2016. Web. 22 September 2026. <https://smartdefine.org/certainly/thesaurus/synonyms>