Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain. It is often accompanied by emotional disturbance and personality changes.

• 痴呆智力能力，例如记忆力、精神集中的能力、判断力等的恶化，常因某器官病疾或头脑紊乱，引起经常伴随着情感波动和性情的变化