childish Synonyms

infantile puerile child silly juvenile immature kiddish tender unbecoming undergrown unfledged unripe unseasoned unsophisticated teen teenage superstitious stupid sophomoric simplistic simple senseless ridiculous puppyish 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 callow