- Definitions|2
- Thesaurus|2.2k
- Abbreviations|0
| secluse(close, quiet, private, isolated, secluded) | |
| shady(adjective, shady) | |
| sneak(verb, clandestine, underground, undisclosed) | |
| solitary(adjective, close, quiet, unusual, detached) | |
| subterranean | |
| sunk(verb, disappeared) | |
| supernatural(adjective, obscure, dark, mysterious, spiritual) | |
| top-secret(clandestine, underground, undisclosed) | |
| top secret(expression, clandestine, underground, undisclosed) | |
| unacknowledged(clandestine, underground, undisclosed) | |
| uncelebrated(strange, new, remote, mysterious, indefinite) | |
| unclear(adjective, hard, obscure, delicate, loose) | |
| unconscious(adjective, subconscious, subliminal) | |
| under wraps(expression, secret, underground, sneaky, covered) | |
| undiscernible | |
| undiscovered(strange, new, remote, mysterious, indefinite) | |
| unexposed(adjective, secret, unseen, latent) | |
| unfrequented(adjective, close, quiet, separate, obscure) | |
| unobserved(adjective, unseen, ignored, undiscovered, overlooked) | |
| unrealized |
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| APA | Smart Define. (2015). hidden thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/hidden/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hidden thesaurus" https://smartdefine.org/hidden/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, hidden thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/hidden/thesaurus/synonyms>. |
| MLA | Smart Define. "hidden thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/hidden/thesaurus/synonyms> |