50 entries under spontaneous topic. ×
| unbidden(adjective, simple, natural, casual, impulsive) | |
| uncompelled(adjective, simple, natural, casual, impulsive) | |
| unconstrained(adjective, simple, natural, casual, impulsive) | |
| unpremediated(adjective, simple, natural, casual, impulsive) | |
| unsophisticated(adjective, simple, natural, casual, impulsive) | |
| up front(expression, adjective, simple, natural, casual) | |
| voluntary(adjective, simple, natural, casual, impulsive) | |
| willing(adjective, simple, natural, casual, impulsive) | |
| in-built | |
| off your own bat(expression, idiom, willing, unforced) |
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| APA | Smart Define. (2015). involuntary thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/involuntary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "involuntary thesaurus" https://smartdefine.org/involuntary/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, involuntary thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/involuntary/thesaurus/synonyms>. |
| MLA | Smart Define. "involuntary thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/involuntary/thesaurus/synonyms> |