Section 13(1) (iii) of Hindu Marriage Act, 1955

Divorce

(1) Any marriage solemnized, whether before or after the commencement of the Act, may, on a petition presented by either the husband or the wife, be dissolved by a decree of divorce on the ground that the other party

(iii) has been incurably of unsound mind, or has suffering continuously or intermittently from mental disorder of such a kind and to such an extent that the petitioner cannot reasonably be expected to live with the respondent.

Explanation: In this clause-
  1. the expression "mental disorder" means mental illness, arrested or incomplete development of mind, psychopathic disorder or any other disorder or disability of mind and include schizophrenia;

  2. the expression "psychopathic disorder" means a persistent disorder or disability of mind (whether or not including sub-normality of intelligence) which results in abnormally aggressive or seriously irresponsible conduct on the part of the other party and whether or not it requires or is susceptible to medical treatment