| mellow(ready, prepared, mature, established, settled) | |
| older(adjective, big) | |
| full grown(expression, idiom, adolescence) | |
| middle-aged | |
| naughty(adjective, vulgar, obscene) | |
| person(noun, mature) | |
| pornographic(adjective, obscene) | |
| reasonable | |
| serious | |
| X-rated(adjective, offensive, dirty, indecent, obscene) | |
| adolescent | |
| adultness | |
| adults | |
| age | |
| ape(adjective, muscular, virile, male, manly) | |
| artificial(adjective, cool, refined, practical, mature) | |
| autumnal | |
| baroness(noun, broad, woman, girl, queen) | |
| beast | |
| beefcake(muscular, manly, manlike) |
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| APA | Smart Define. (2016). adult thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/adult/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "adult thesaurus" https://smartdefine.org/adult/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, adult thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/adult/thesaurus/synonyms>. |
| MLA | Smart Define. "adult thesaurus" 30 March 2016. Web. 30 September 2026. <https://smartdefine.org/adult/thesaurus/synonyms> |