112 entries under spontaneous topic. ×
| unintentional(adjective, simple, casual, routine, impulsive) | |
| unpaid | |
| unpremediated(adjective, simple, casual, impulsive, willing) | |
| unprescribed | |
| unwitting | |
| urbane(adjective, calm, open, smooth, simple) | |
| willing(adjective, simple, casual, impulsive, artless) | |
| without ceremony(expression, adjective, simple, straightforward, casual) | |
| autonomous | |
| chosen | |
| deliberate | |
| designful | |
| discretional | |
| elected | |
| free-willed | |
| freely | |
| gratuitous | |
| honorary | |
| in-built(characteristic, essential, instinctive, intrinsic) | |
| independent |
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| APA | Smart Define. (2016). natural thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/natural/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "natural thesaurus" https://smartdefine.org/natural/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, natural thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/natural/thesaurus/synonyms>. |
| MLA | Smart Define. "natural thesaurus" 15 February 2016. Web. 30 September 2026. <https://smartdefine.org/natural/thesaurus/synonyms> |