Sure
Mutual synonyms
Both words in one sentence
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Adult Fear: Your 5 year old child disappears one night and police specialists are completely sure he / she left willingly.
Source: Anime / Fantastic Children - In Edmond Hamilton's Star Kings duology, the second book starts with the protagonist going to a psychiatrist willingly in order to cure his memories of the first book's events (which he isn't sure are true).
Source: Cuckoo Nest -
They manage to warn the Waynes, who decide that Batman is too important to the world and willingly go to their deaths — though they make sure Bruce knows how much they love him before they leave.
Cite this Source
Willingly and Sure. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/sure/willingly
Sure & Willingly. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/sure/willingly>.
Willingly or Sure. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/sure/willingly.
Google Ngram Viewer shows how "sure" and "willingly" have occurred on timeline