14 entries under plainly topic. ×

39
definitely(adverb, interjection, absolutely, completely, positively)
31
positively(adverb, interjection, certain, limited, absolutely)
27
indubitably(adverb, interjection, absolutely, easily, clearly)
26
undoubtedly(adverb, certain, limited, absolutely, positively)
16
clearly(adverb, absolutely, really, positively, definitely)
13
to be sure(expression, idiom, adverb, interjection, absolutely)
12
obviously(adverb, absolutely, positively, clearly)
12
indeed(adverb, well, truth, absolutely, assent)
10
without doubt(expression, adjective, idiom, adverb, absolutely)
9
for certain(expression, idiom, adverb, certainty, absolutely)
8
indisputably(adverb, really, clearly, unquestionably)
4
distinctly(adverb, absolutely, really, positively, precisely)
4
inevitably(adverb, absolutely, clearly, definitely)
3
inexorably(adverb, absolutely, completely, clearly, definitely)
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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>