sexless  
adjective uk/ˈseks.ləs/ us/ˈseks.ləs/
  (SEX)      
  缺乏性感的,不性感的
not being sexually attractive or not having an interest in sex
  She seems rather sexless. 我总是觉得她一点儿都不性感。 
   (MALE/FEMALE)      
 无性别的,无性特征的
without sexual characteristics
 Compare: neuter verb