Probably
Probably adverb - By reasonable assumption.
Sincere and probably are semantically related. In some cases you can use "Sincere" instead an adjective "Probably".
Nearby Words: probable, probability
Both words in one sentence
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Unfortunately though he was probably being sincere, her friends don't believe him, and think he's mocking them with the way he's so quick to apologize.
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She picks on Lilo despite probably knowing Lilo is an orphan and doesn't have many friends, refuses to play games with her and rejects Lilo's sincere apology for attacking her.
Source: Disney / Lilo & Stitch -
And while Ozymandias trivializes the incident, the severe beating he administers (or has administered) to The Comedian as part of murdering him demonstrates that he probably wasn't sincere.
Source: Let's You and Him Fight
Cite this Source
Sincere and Probably. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/probably/sincere
Probably & Sincere. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/probably/sincere>.
Sincere or Probably. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/probably/sincere.
Google Ngram Viewer shows how "probably" and "sincere" have occurred on timeline