A party is regarded as not having the mental capacity to solemnize the marriage, if suffering from :

Unsoundness of mind, mental disorder and recurrent insanity are all covered by the mental-capacity conditions in section 5(ii) of the Hindu Marriage Act, 1955. The provision requires inability to give valid consent due to unsoundness of mind, a mental disorder making a person unfit for marriage and procreation, or recurrent attacks of insanity.