Refers to a serious psychological disorder or condition that makes a person incapable of fulfilling essential marital obligations. The incapacity must have existed at the time of marriage, be medically identified with detailed testimony about its root cause, be grave enough to prevent fulfilling duties, and be incurable. This requires expert opinions from psychologists or psychiatrists and is the most commonly cited ground, though also one of the most difficult and expensive.
Fraud involves the deceit or misrepresentation of significant information before or during marriage. Specific grounds include: non-disclosure of a previous criminal conviction involving moral turpitude, concealment by the wife of pregnancy by another man, concealment of a sexually transmissible disease, and concealment of drug addiction, habitual alcoholism, homosexuality, or lesbianism existing at the time of marriage. The breach of trust inherent in fraud cases critically undermines marital stability.
This ground applies when one party was coerced into marriage through actual physical harm, threats, or psychological pressure that removed their free consent. It differs from fraud in that the person knows they don't want to marry but is compelled to do so. Petitioners must present convincing evidence like testimonies or documented threats to prove lack of genuine consent. This is particularly important in cases involving abusive or controlling relationships.