详细解释:a. 无价值的, 徒然的, 空虚的, 自负的, 愚蠢的
相关词组:
in vain
try in vain to do sth
take sb's name in vain
be vain of
词型变化：
名词:vainness副词:vainly形容词比较级:vainer最高级:vainest英语解释：
形容词 vain:
characteristic of false pride; having an exaggerated sense of self-importance同义词：conceited, egotistic, egotistical, self-conceited, swollen, swollen-headed