demented

adj. 发狂的，疯狂的；精神错乱的

v. 精神错乱；变得痴呆（dement的过去分词）

中文词源

demented 发狂的

de-, 向下，离开。-ment, 思想，词源同mind. 指思想偏离正轨的，发狂的。

1. mental => demented.

1. He had been granted his own TV show by some demented executive.: 某个愚蠢的主管已经批准他自己来做一个电视节目。

2. Nursing a demented person is an all-consuming task.: 照顾一个精神病人是时刻都要劳神费力的苦差事。

4. At what point does it become necessary to place a demented person in a nursing home?: 到了什么时候算是有必要把早老性痴呆病人送到养老院去？