Mental illness, psychological disorder, or diseased condition of the mind; an archaic term.
Noun formed from 'brainsick' by adding -ness. Combines 'brain' + 'sick' + -ness, creating an abstract noun for the state or quality of being mentally ill.
This term shows how older English created medical categories—'brainsickness' grouped together what we now might call depression, anxiety, madness, and other conditions. It's actually a reminder that mental health is fundamentally about brain health.
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