333 entries under adjective topic. ×
| dour(evil, mysterious, threatening, nefarious) | |
| glowering(evil, mysterious, threatening, nefarious) | |
| glum(evil, mysterious, threatening, nefarious) | |
| illicit | |
| impenetrable(obscure, dark, superior, strange) | |
| inconspicuous(humble, minor, unknown, hidden) | |
| reserved(close, quiet, special, shy) | |
| sub-rosa(sensitive, dishonest, cunning, deceitful) | |
| sub rosa | |
| subterranean(hidden, underground) | |
| supernatural(obscure, dark, strange, odd) | |
| tight-lipped(quiet, reserved, private, reticent) | |
| top-secret(clandestine, underground, undisclosed, classified) | |
| uncommunicative(quiet, reserved, private, reticent) | |
| unenlightened(hidden, clandestine, underground, undisclosed) | |
| unfrequented(close, quiet, mild, shy) | |
| unintelligible(obscure, dark, superior, uncertain) | |
| unknowable(obscure, dark, superior, strange) | |
| unnamed(strange, unknown, indefinite, undisclosed) | |
| unpublishable |
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| APA | Smart Define. (2016). secret thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/secret/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "secret thesaurus" https://smartdefine.org/secret/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, secret thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/secret/thesaurus/synonyms>. |
| MLA | Smart Define. "secret thesaurus" 31 March 2016. Web. 27 September 2026. <https://smartdefine.org/secret/thesaurus/synonyms> |