youthfully
词形变化：
副词: youthfully | 名词: youthfulness |
同义词：
young | childish | juvenile | fresh | callow | boyish | adolescent | kiddish | puerile | maiden | virgin | green | childlike | girlish | young at heart | vigorous | energetic | lively | enthusiastic | active | sprightly | vernal |
反义词：