Earnest
Earnest adjective - Not joking or playful in mood or manner.
Sure and earnest are semantically related. In some cases you can use "Sure" instead an adjective "Earnest".
Nearby Words: earnestness, earnestly
Both words in one sentence
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The first episode in general didn't seem to be sure if Donnie was a sleazy, Uwe Boll-style bad filmmaker or an earnest, Ed Wood-style bad filmmaker.
Source: Web Video / Demo Reel - Although her canonical Crouching Moron, Hidden Badass nature makes it hard to tell for sure, she seems to generally enjoy her eternal un-life, especially when it comes to teasing her overly-earnest subordinate, Youmu.
Source: Living Forever Is Awesome
Cite this Source
Sure and Earnest. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/earnest/sure
Earnest & Sure. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/earnest/sure>.
Sure or Earnest. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/earnest/sure.
Google Ngram Viewer shows how "earnest" and "sure" have occurred on timeline