<p><strong>Adjective</strong></p><ul><li>immature or inexperienced: a callow youth.</li><li>Synonyms: jejune, puerile, naive, raw, green, unseasoned</li><li>Antonyms: grown-up, experienced, adult, mature</li><li>(of a young bird) featherless; unfledged.</li></ul><p><strong>Noun</strong></p><ul><li>a recently hatched worker ant.</li></ul>