| unwilling(obligatory, compulsory) | |
| willing(adjective, simple, natural, casual, impulsive) | |
| zoological(adjective, physical, bodily, visceral) | |
| connatural(characteristic, reasonable, ordinary, natural, normal) | |
| aboveboard(simple, plain, fresh, innocent, sincere) | |
| ad-lib(adjective, simple, passionate, violent, natural) | |
| aimless | |
| animalian | |
| animalic | |
| animalistic | |
| artful(adjective, intuitive) | |
| astute(adjective, intuitive) | |
| atavistic | |
| beastlike | |
| being oneself(expression, adjective, open, simple, easy) | |
| birth | |
| break loose(expression, adjective, simple, natural, casual) | |
| brutal | |
| brutelike | |
| built-in |
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| APA | Smart Define. (2015). instinctive thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/instinctive/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "instinctive thesaurus" https://smartdefine.org/instinctive/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, instinctive thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/instinctive/thesaurus/synonyms>. |
| MLA | Smart Define. "instinctive thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/instinctive/thesaurus/synonyms> |