demented
UK[dɪˈmɛntɪd]US[dɪˈmɛntɪd]
adj
Behaving in a wild and irrational way, often because of mental illness.
adj
Extremely foolish, illogical, or crazy.
Morpheme Breakdown
de
ment
ed
de
away/from
ment
mind
ed
adjective suffix
Etymology
The word "demented" originates from the Latin verb dementare, meaning "to drive mad." This verb itself is constructed from the prefix de- ("away from") and the noun mens, ment- ("mind"), conveying a literal sense of being "away from one's mind" or "out of one's mind." The past participle form dementatus gave rise to the English adjective, which entered the language in the late 16th century. The core semantic logic has remained remarkably consistent: the state of having one's rational mind removed or reversed, leading to madness or extreme irrationality.
Analysis
Structure: de (away/from) + ment (mind) + ed (adjective suffix)
- de: A Latin prefix meaning "away from," "down," or "off." It indicates removal or reversal.
- ment: From Latin mens, ment- meaning "mind." It is a root denoting the faculty of thought and intellect.
- ed: An Old English suffix used to form adjectives from nouns or verbs, indicating possession of a quality.
Examples
The demented patient required constant care.
He had a demented plan to build a rocket in his backyard.
The villain's demented laughter echoed through the hall.