What is the legal definition of insanity?

The legal definition of insanity varies by jurisdiction, but it generally refers to a mental condition that impairs an individual's ability to understand the nature of their actions or distinguish right from wrong at the time of committing a crime. The most commonly used standard is the M'Naghten Rule, which states that a person may be declared legally insane if they were suffering from a severe mental disorder that prevented them from comprehending their actions or understanding the consequences. Insanity defenses are often complex and involve psychiatric evaluations and legal standards.