| youthful | |
| boyish(adjective, mature, youthful) | |
| incipient | |
| moppet | |
| new baby | |
| puerile(adjective, childish) | |
| undeveloped(adjective, immature) | |
| unripened | |
| youngster | |
| unripe | |
| juvenile person | |
| kiddish | |
| babyish | |
| bairn | |
| beardless(adjective, old) | |
| blooming | |
| blossoming | |
| burgeoning | |
| callow | |
| clean |
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| APA | Smart Define. (2016). adult thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/adult/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "adult thesaurus" https://smartdefine.org/adult/thesaurus/antonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2016, adult thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/adult/thesaurus/antonyms>. |
| MLA | Smart Define. "adult thesaurus" 30 March 2016. Web. 1 October 2026. <https://smartdefine.org/adult/thesaurus/antonyms> |