What is unsound mind ?

Unsound mind two types.

1.Permanent unsound mind

suffering Brain encephlity, memory lost genitacally or with an accident, psychatric patient 

2.Temporary unsound mind.

Under influence of alchohal

If a mature person have these behave as you describes, Bachpana, Short temeper attitute, non sense talking .. Now a days, there is a fraud in marriages and girl's parents hides those facts about their daughters. 

these are kind of unsound mind only. but problem is that these criteria are not comes under test of unsound mind.

The words "Unsound mind" have been adopted in several statutes, and sometimes indiscriminately used to signify, not only lunacy, which is periodical madness, but also a permanent adventitious insanity as distinguished from idiocy.

The term unsound mind seems to have been used in those statutes in the same sense as insane; but they have been said to import that the party was in some such state as was contradistinguished from idiocy and from lunacy, and yet such is made him a proper subject of a commission to inquire of idiocy and lunacy.
 

Dhiraj Kumar,

According to IPC, the nature and extent of the unsoundness of mind required to be exempted from criminal liability being such as would make the offender incapable of knowing the nature of the act, or that he is doing what is wrong or contrary to law. It is only 'unsoundness of mind ' which naturally impairs the cognitive faculties of mind that can form a ground of exemption from criminal liability. So, I dont think the characters as u described form an 'unsound mind' .

Can a compromise be declared  illegal if challenged, if the person has been under treatment  for depression  few days  ago before signing the compromise as in the definition of unsound mind  tells that if the person is a psy.   patient  comes under unsound position?

Can a NRI  as well as an Advocate  command a person of feeble mind  and under depression person to sign a compromise?Can it be considered undue influence for Court proceedings with medical proof?

These words have been adopted in several statutes, and sometimes indiscriminately used to signify, not only lunacy, which is periodical madness, but also a permanent adventitious insanity as distinguished from idiocy.

The term unsound mind seems to have been used in those statutes in the same sense as insane; but they have been said to import that the party was in some such state as was contradistinguished from idiocy and from lunacy, and yet such is made him a proper subject of a commission to inquire of idiocy and lunacy.
 

a person with unsound mind exempts criminal liablity

For the proof of unsound mind the two competent medical practitioners should declare the person is of unsound mind, mere allegation is not sufficient to say a person is of unsoundmind or bachpana etc.

Yes it can be the strong ground  for divorce.

Dear Mr. Ahemad,

Is there and decided case where Hon'le Court has take note of the same in Divorce case.

Please advise.