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guilty but mentally ill n: a verdict available in some jurisdictions in cases involving an insanity defense in which the defendant is considered as if having been found guilty but is committed to a mental hospital rather than imprisoned if an examination shows a need for psychiatric treatment compare not guilty by reason of insanity
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.