| green(adjective, healthy, experienced, immature) | |
| immature(adjective, inexperienced, young) | |
| young(adjective, old, immature) | |
| childish(adjective, silly, immature) | |
| youthful(adjective, new, old, immature) | |
| jejune | |
| juvenile(adjective, childish) | |
| unripe(noun, adjective, reading, immature) | |
| sentimental(hard, cool) | |
| silly(adjective, foolish, absurd, giddy) | |
| infantile(adjective, babyish) | |
| babyish(adjective, like) | |
| undeveloped(adjective, immature) | |
| unfledged | |
| inexperienced(adjective, old, immature, seasoned) | |
| kiddish | |
| unformed(adjective, developed) | |
| puerile(adjective, childish) | |
| adolescent | |
| embryonic |
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Mature on
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| APA | Smart Define. (2015). mature thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/mature/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "mature thesaurus" https://smartdefine.org/mature/thesaurus/antonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, mature thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/mature/thesaurus/antonyms>. |
| MLA | Smart Define. "mature thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/mature/thesaurus/antonyms> |