63 entries under certainly topic. ×

72
absolutely(adverb, interjection, just, absolutely, really)
51
certainly(adverb, interjection, absolutely, completely, positively)
45
positively(adverb, interjection, absolutely, really, positively)
37
surely(adverb, absolutely, really, exactly, positively)
34
unquestionably(adverb, doubt, absolutely, exactly, positively)
33
indubitably(adverb, interjection, absolutely, unquestionably)
31
assuredly(adverb, interjection)
27
unequivocally(adverb, absolutely, really, clearly)
20
undoubtedly(adverb, absolutely, positively, easily)
20
clearly(adverb, absolutely, really, exactly)
19
truly(adverb, absolutely, really, exactly, positively)
19
for sure(expression, idiom, interjection, just, absolutely)
17
exactly(adverb, good, fine, true, sure)
16
categorically(adverb, absolutely, exactly, positively)
14
obviously(adverb, absolutely, positively, clearly)
13
completely(adverb, just, absolutely, severely)
12
precisely(adverb, good, fine, true, sure)
12
really(adverb, absolutely, exactly, positively)
12
undeniably(adverb, categorically)
11
plainly
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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>