Definitions

1. verb

to deprive of reason or sanity; drive insane

“The stress of the situation began to dement her.”

2. verb

to cause to become insane or deranged; drive mad

“The cruel treatment demented the animal.”

3. noun

one who is insane or deranged; a mad person

“He was considered a dement after the accident.”

4. noun

a person with a mental disorder, especially one with severe dementia

“The dement was taken care of by a professional caregiver.”