43 entries under idiom topic. ×
| subject of controversy(noun, expression, question, secret) | |
| subject of inquiry(noun, expression, question, secret) | |
| classified information(expression, confidence, secret, mystery) | |
| frontiers of knowledge(expression, secret, mystery, brain-twister) | |
| matter of ignorance(expression, secret, mystery, brain-twister) | |
| mysterious puzzle(expression, secret, mystery, brain-twister) | |
| mystery of mysteries(expression, secret, mystery, brain-twister) | |
| baffling mystery(expression, secret, mystery, brain-twister) | |
| baffling problem(expression, secret, mystery, brain-twister) | |
| confidential communication(expression, secret, mystery, brain-twister) | |
| dark horse(expression, secret, mystery, brain-twister) | |
| enigmatic question(expression, secret, mystery, brain-twister) | |
| guarded secret(expression, secret, mystery, brain-twister) | |
| perplexed question(expression, secret, mystery, brain-twister) | |
| private matter(expression, secret, mystery, brain-twister) | |
| privileged communication(expression, secret, mystery, brain-twister) | |
| profound secret(expression, secret, mystery, brain-twister) | |
| puzzling thing(expression, secret, mystery, brain-twister) | |
| restricted information(expression, secret, mystery, brain-twister) | |
| unexplored ground(expression, secret, mystery, brain-twister) |
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| APA | Smart Define. (2016). enigma thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/enigma/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "enigma thesaurus" https://smartdefine.org/enigma/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, enigma thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/enigma/thesaurus/synonyms>. |
| MLA | Smart Define. "enigma thesaurus" 1 April 2016. Web. 26 September 2026. <https://smartdefine.org/enigma/thesaurus/synonyms> |