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14
closed book(noun, trouble, challenge, puzzle)
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APASmart Define. (2016). brain-teaser thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/brain-teaser/thesaurus/synonyms
ChicagoSmart Define. 2016. "brain-teaser thesaurus" https://smartdefine.org/brain-teaser/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, brain-teaser thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/brain-teaser/thesaurus/synonyms>.
MLASmart Define. "brain-teaser thesaurus" 1 April 2016. Web. 21 September 2026. <https://smartdefine.org/brain-teaser/thesaurus/synonyms>