childish Synonyms

infantile child immature kiddish puerile juvenile silly undergrown unfledged unripe tender teenage teen unseasoned unbecoming superstitious puppyish ridiculous senseless simple simplistic slipslop sophomoric stupid unsophisticated unwise vernal schoolboyish puppylike birdbrained wet behind the ears preadolescent pubertal unripened unweaned well-preserved boylike man-child gooselike young youngish youthful scatty teenaged ahistorical baby-faced younger youngest young-looking absurd