62 entries under spontaneous topic. ×
| off-the-cuff(adjective, simple, natural, casual, impulsive) | |
| off top of head(expression, adjective, idiom, simple, natural) | |
| offhand(adjective, simple, natural, casual, impulsive) | |
| opted(adjective, free, deliberate, natural, willing) | |
| simple(adjective, natural, casual, impulsive, willing) | |
| unartful(adjective, simple, natural, casual, impulsive) | |
| unavoidable(adjective, simple, natural, casual, impulsive) | |
| unconscious(adjective, simple, natural, casual, impulsive) | |
| uncontrived(adjective, simple, natural, casual, impulsive) | |
| uncontrolled(adjective, simple, natural, casual, impulsive) | |
| unintentional(adjective, simple, natural, casual, impulsive) | |
| unplanned(adjective, simple, natural, casual, impulsive) | |
| unpremediated(adjective, simple, natural, casual, impulsive) | |
| unprescribed(adjective, free, deliberate, natural, willing) | |
| unsophisticated(adjective, simple, natural, casual, impulsive) | |
| unstudied(adjective, simple, natural, casual, impulsive) | |
| up front(expression, adjective, simple, natural, casual) | |
| wished(adjective, free, deliberate, natural, willing) | |
| artless(natural, impulsive, unprompted, spur-of-the-moment) | |
| effortless |
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| APA | Smart Define. (2015). voluntary thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/voluntary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "voluntary thesaurus" https://smartdefine.org/voluntary/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, voluntary thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/voluntary/thesaurus/synonyms>. |
| MLA | Smart Define. "voluntary thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/voluntary/thesaurus/synonyms> |