| informal(adjective, simple, relaxed, familiar, casual) | |
| unauthorized(adjective, informal, irregular, unwarranted, illegal) | |
| private(adjective, intimate, secret, personal, confidential) | |
| off the record(expression, adjective, idiom, adverb, personal) | |
| unceremonious(adjective, simple, plain, relaxed, straightforward) | |
| casual(adjective, simple, informal, relaxed, familiar) | |
| natural(adjective, simple, easy, plain, straightforward) | |
| relaxed | |
| unconfirmed(adjective, unauthorized) | |
| unsanctioned(adjective, informal, illegal, pirate, unauthorized) | |
| easy | |
| irregular(adjective, wrong, improper, unwarranted, unacceptable) | |
| loose(adjective, simple, easy, plain, modest) | |
| illegal | |
| nonofficial | |
| secret(adjective, private, personal, confidential, hush-hush) | |
| unauthorised | |
| unconventional(adjective, simple, wrong, plain, relaxed) | |
| unlawful | |
| confidential(adjective, adverb, sensitive, special, intimate) |
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| APA | Smart Define. (2016). unofficial thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unofficial/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unofficial thesaurus" https://smartdefine.org/unofficial/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, unofficial thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unofficial/thesaurus/synonyms>. |
| MLA | Smart Define. "unofficial thesaurus" 26 February 2016. Web. 20 September 2026. <https://smartdefine.org/unofficial/thesaurus/synonyms> |