| focal(adjective, private, mental, inner) | |
| formula(noun, design, conclusion, confidence, means) | |
| hid | |
| indecipherable(adjective, dark, uncertain, mysterious, unfathomable) | |
| knowing(adjective, deep, thoughtful, cunning, crafty) | |
| masked(adjective, concealed) | |
| mystification(noun, trouble, challenge, question, puzzle) | |
| mystifying(adjective, evil, obscure, dark, strange) | |
| nonpublic(personal, confidential, hush-hush) | |
| not for publication(expression, adjective, idiom, sensitive, private) | |
| on the sly(expression, idiom, private, hidden, sneaky) | |
| out of sight(expression, idiom) | |
| paradox(noun, trouble, challenge, question, puzzle) | |
| password(noun, confidence, mystery, unrevealed) | |
| perplexity(noun, question, problem, puzzle, obscurity) | |
| privacy | |
| private matter | |
| privately | |
| protected | |
| psychological(adjective, private, mental, inner) |
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| APA | Smart Define. (2016). secret thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/secret/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "secret thesaurus" https://smartdefine.org/secret/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, secret thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/secret/thesaurus/synonyms>. |
| MLA | Smart Define. "secret thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/secret/thesaurus/synonyms> |