Question mark and Unsolved problem

Question mark

Question mark noun - A punctuation mark (?) placed at the end of a sentence to indicate a question.
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Synonyms for Question mark

Unsolved problem and question mark are semantically related. In some cases you can use "Unsolved problem" instead a noun phrase "Question mark".

Unsolved problem

Definitions of Question mark not found.

Question mark and unsolved problem are semantically related. You can use "Question mark" instead a noun phrase "Unsolved problem".
Cite this Source
Unsolved problem and Question mark. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/question_mark/unsolved_problem
Question mark & Unsolved problem. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/question_mark/unsolved_problem>.
Unsolved problem or Question mark. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/question_mark/unsolved_problem.
Google Ngram Viewer shows how "question mark" and "unsolved problem" have occurred on timeline