- (especially British English)
behaving in a crazy way because you are extremely upset or worried 極度焦躁不安的；憂慮失常的；發狂的 I've been nearly demented with worry about you. 我一直爲你擔心，都快發瘋了。 The children have driven me demented today. 孩子們今天把我逼瘋了。 He was crashing about the house like a demented animal. 他像一只發狂的動物一樣在房子裏亂撞。
- (old-fashioned or
medical 醫學 suffering from dementia 癡呆的；發狂的
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’.