95 entries under expression topic. ×
| closed book(noun, idiom, trouble, challenge) | |
| off the record(adjective, idiom, separate, private) | |
| under wraps(adjective, idiom, adverb, show) | |
| mystery story(noun, idiom, mystery) | |
| classified information(noun, confidence, mystery, unrevealed) | |
| not for publication(adjective, idiom, sensitive, private) | |
| on the sly(idiom, private, hidden, sneaky) | |
| out of sight | |
| top secret(adjective, sensitive, private, hidden) | |
| under cover(adjective, spy, covert) | |
| behind the scenes(idiom, personal, confidential, hush-hush) | |
| in secret | |
| behind the curtain | |
| beyond range(obscure, remote, faraway, far-off) | |
| confidential information(noun, confidence, perplexity, mystery) | |
| far back(obscure, remote, faraway, far-off) | |
| glossed over(unseen, ignored, undiscovered, overlooked) | |
| hush hush | |
| in a cloud | |
| in a fog |
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| APA | Smart Define. (2016). secret thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/secret/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "secret thesaurus" https://smartdefine.org/secret/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, secret thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/secret/thesaurus/synonyms>. |
| MLA | Smart Define. "secret thesaurus" 31 March 2016. Web. 20 September 2026. <https://smartdefine.org/secret/thesaurus/synonyms> |