The physician James Cowles Prichard first used the phrase to describe a mental disorder in 1835 in his Treatise on insanity and other disorders affecting the mind.
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Later, Maudsley discussed moral insanity as a sign of poor moral willpower or moral sense.
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The concept of psychopathy has been indirectly connected to the early 1800s with the work of Pinel (1801; "mania without delirium") and Pritchard (1835; "moral insanity"), although historians have largely discredited the idea of a direct equivalence.