| unaware(adjective, unthinking, superficial, dutiful, sketchy) | |
| unbidden(adjective, simple, natural, casual, impulsive) | |
| unchanged | |
| unconsidered(thoughtless, impetuous, unwary) | |
| uncontrived(adjective, simple, natural, casual, impulsive) | |
| undesigned | |
| uniform | |
| unlearned(natural, involuntary, reflex) | |
| unplanned(adjective, free, simple, fake, natural) | |
| unvaried | |
| unwilling(obligatory, compulsory) | |
| voluntary(adjective, simple, natural, casual, impulsive) | |
| winging it(expression, free, casual, thoughtless, unrehearsed) | |
| accidental | |
| accordant | |
| ad hoc(expression, free, informal, casual, unrehearsed) | |
| ad lib(adjective, free, informal, casual, spontaneous) | |
| alike | |
| assault rifle(expression, idiom, arms) | |
| auto- |
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| APA | Smart Define. (2015). automatic thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/automatic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "automatic thesaurus" https://smartdefine.org/automatic/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, automatic thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/automatic/thesaurus/synonyms>. |
| MLA | Smart Define. "automatic thesaurus" 8 October 2015. Web. 20 September 2026. <https://smartdefine.org/automatic/thesaurus/synonyms> |