- (especially British English)
behaving in a crazy way because you are extremely upset or worried 极度焦躁不安的；忧虑失常的；发狂的 I've been nearly demented with worry about you. 我一直为你担心，都快发疯了。 The children have driven me demented today. 孩子们今天把我逼疯了。 He was crashing about the house like a demented animal. 他像一只发狂的动物一样在房子里乱撞。
- (old-fashioned or
medical 医学 suffering from dementia 痴呆的；发狂的
Word Originmid 17th cent.: past participle of earlier dement ‘drive mad’, from Old French dementer or late Latin dementare, from demens ‘out of one's mind’.