相关单词近義詞 immature 不成熟的, small 小的, undersized 尺寸不足的, weak 弱的, unused 未用過的, unfledged 羽毛未豐的, infantile 嬰兒的, developing 發展中的臨近詞under, underprop相似詞undercook, undercover, undercurrent, undercut, underdog, underdone, underdressed, underemployed, 返回 underdeveloped