Synonyms|913Antonyms|179|Broader|11Narrower|5Related|734
3
sure thing(expression, idiom, absolutely, very, really)
3
unreservedly
3
very well(expression, idiom, good, fine, assent)
3
well
3
without a doubt(expression, idiom, adverb, positively, unquestionably)
2
affirmatively(adverb, affirmatively)
2
all
2
alright
2
altogether
2
and no mistake(expression, idiom, certainty)
2
as expected
2
assertively(adverb, affirmatively)
2
at all events(expression, idiom, certainty)
2
at any rate(expression, idiom, certainty)
2
authentically(adverb, truly)
2
axiomatically(adverb, truly)
2
confidently
2
course
2
declaratively(adverb, affirmatively)
2
demonstrably
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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>