| off-hand | |
| off-the-cuff(adjective, simple, plain, relaxed, straightforward) | |
| offhand | |
| offhanded | |
| officiousness | |
| offstage(adjective, informal, casual) | |
| on the QT(expression, idiom, adverb, sensitive, private) | |
| open(adjective, simple, plain, relaxed, straightforward) | |
| ordinary(adjective, simple, plain, relaxed, straightforward) | |
| outlaw | |
| outlawed | |
| plain | |
| privy(special, intimate, secret, private, personal) | |
| punishable | |
| savagedom | |
| sociable | |
| spontaneous(adjective, simple, easy, plain, straightforward) | |
| sporty(adjective, simple, plain, relaxed, straightforward) | |
| straightforward(adjective, simple, easy, plain, relaxed) | |
| summary |
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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> |