mature Antonyms

immature childish ossify slide slip slump sophomoric stagnate subside superficial teen teenage tender unfledged unformed unripe silly sentimental premature prepaid pubescent puerile pupal puppyish raw raze recidivate regress relapse retrograde retrogress revert unseasoned unsophisticated vernal underdeveloped undeveloped kiddish fall off preadolescent prepubertal prepupal schoolgirlish unaged undigested undried untried unversed well-preserved neonatal