| hush-hush(adjective, special, intimate, secret, private) | |
| hushed(special, intimate, secret, private, personal) | |
| impermissible | |
| improv(adjective, simple, plain, relaxed, straightforward) | |
| in confidence(expression, adverb, sensitive, confidential, eyes-only) | |
| inconspicuous(adjective, simple, plain, relaxed, straightforward) | |
| informality | |
| informally | |
| inofficial | |
| inside(special, intimate, secret, private, personal) | |
| intimate(adjective, simple, plain, relaxed, straightforward) | |
| justiciable | |
| laid back(expression, adjective, simple, relaxed, straightforward) | |
| lawless | |
| mixed(adjective, simple, plain, relaxed, straightforward) | |
| motley(adjective, simple, plain, relaxed, straightforward) | |
| non-official | |
| nonconstitutional | |
| nonlegal | |
| nonlicit |
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| APA | Smart Define. (2016). unofficial thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unofficial/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unofficial thesaurus" https://smartdefine.org/unofficial/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, unofficial thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unofficial/thesaurus/synonyms>. |
| MLA | Smart Define. "unofficial thesaurus" 26 February 2016. Web. 27 September 2026. <https://smartdefine.org/unofficial/thesaurus/synonyms> |