derangedde‧ranged /dɪˈreɪndʒd/ adjective 
Word Origin
a deranged gunman—derangement noun [countable, uncountable]
Word OriginWORD ORIGINderanged
ExamplesOrigin:
1700-1800 derange ‘to make untidy, make mad’ (18-21 centuries), from French dérangerEXAMPLES FROM THE CORPUS
Thesaurus- And they cater to the deranged grin fetishes of retired colonels from the home counties.
- AS good as it got for the deranged Los Angeles combo.
- It's beginning to look like a deranged version of Live Aid.
- Small and thin, Terri was dressed, as usual, in the manner of a deranged Victorian governess.
- The chameleon on the mirror flipping without rest slips into some deranged state far from sanity.
- This was after the el-Aqse mosque had been burned by a deranged tourist.
- To most people today the prophecy about the second coming seems deranged and the other about everlasting life highly questionable.
THESAURUS► mentally ill
someone who is deranged behaves in a crazy or dangerous way, usually because they are mentally ill: having an illness that affects your mind and your behaviour: · Many mentally ill people are treated in the community.· He was declared mentally ill and unfit to stand trial.
► crazy informal mentally ill: · I couldn’t think straight. I felt like I was going crazy (=becoming crazy).
► mad old-fashioned mentally ill. This word is now usually considered offensive, and is usually used in a different meaning, when you think that someone’s ideas are not sensible: · Swift himself went mad (=became mad) later in life.· a mad old woman
► insane [not before noun] old-fashioned having a serious and permanent mental illness: · She went insane after her two young sons were murdered.· a hospital for the criminally insane
► disturbed not behaving in a normal way because of mental or emotional problems, especially problems that are caused by bad experiences: · She teaches emotionally disturbed children.· Her experiences left her deeply disturbed.
► unstable having an emotional state that often changes very suddenly: · Her mother was mentally unstable.· He lived in a small Putney flat with his ageing Aunt Bunny, and his emotionally unstable sister, Nancy.· He was too unstable to be a leader.
► deranged behaving in a crazy or dangerous way, usually because of being mentally ill: · A deranged young woman entered the school and took the life of one young boy.
► psychopathic having a serious and permanent mental illness that causes violent or criminal behaviour: · The film is about a psychopathic killer.
► psychotic suffering from or caused by a serious mental illness that changes your character and makes you unable to behave in a normal way: · psychiatric services for chronic psychotic patients.· There is a tendency for psychotic illnesses to be inherited.
► neurotic relating to or suffering from a mental illness that makes you unreasonably worried of frightened: · His mother was neurotic and insecure.· She’s neurotic about her weight.· A bored or lonely horse may become so neurotic that it chases itself around in circles.
WORD SETS► Psychology/Psychiatryagoraphobia, nounagoraphobic, noun-aholic, suffixanalyse, verbanalysis, nounanalyst, nounanorexia, nounantidepressant, nounautism, nounbattle fatigue, nounbehaviourism, nounbreakdown, nounbulimia, nouncatharsis, nouncertify, verbclaustrophobia, nouncognition, nouncognitive, adjectivecomplex, nouncompulsive, adjectivecounsel, verbcounselling, nouncrazed, adjectivecrazy, adjectivedefence mechanism, noundelusion, noundemented, adjectivedementia, noundenial, noundepressed, adjectivedepression, noundepressive, adjectivedepressive, nounderanged, adjectivediminished responsibility, noundipsomaniac, noundisordered, adjectivedisturbance, noundysfunctional, adjectiveeating disorder, nouneccentricity, nounego, nounelectric shock therapy, nounemotional, adjectiveexhibitionism, nounextra-sensory perception, nounfixation, nounFreudian, adjectiveFreudian slip, noungroup therapy, nounhallucinate, verbhydrophobia, nounhypnosis, nounhypnotic, adjectivehypnotise, verbhypnotist, nounhypnotize, verbid, nouninferiority complex, nouninsane, adjectiveinsanity, nounkleptomania, nounkleptomaniac, nounlibido, nounlinear, adjectivemaladjusted, adjectivemania, nounmanic, adjectivemanic depression, nounmanic depressive, nounmental, adjectivemental age, nounmental hospital, nounmentally handicapped, adjectivemidlife crisis, nounmisogynist, nounmixed up, adjectivenerve, nounnervous, adjectivenervous breakdown, nounnervous system, nounneural, adjectiveneuro-, prefixneurology, nounneurosis, nounneurotic, adjectiveobsessive, nounoedipal, adjectiveOedipus complex, nounpadded cell, nounparanoia, nounparanoid, adjectivepathological, adjectivepathology, nounpatterning, nounphallic, adjectivephobia, noun-phobia, suffixphrenology, nounpost-traumatic stress disorder, nounprecognition, nounpsyche, nounpsychiatric, adjectivepsychiatrist, nounpsychiatry, nounpsychic, adjectivepsycho, nounpsycho-, prefixpsychoanalysis, nounpsychoanalyst, nounpsychoanalyze, verbpsychobabble, nounpsychodrama, nounpsychokinesis, nounpsychological, adjectivepsychologist, nounpsychology, nounpsychopath, nounpsychosis, nounpsychosomatic, adjectivepsychotherapy, nounpsychotic, adjectivepyromaniac, nounrepression, nounresidential treatment facility, nounRorschach test, nounsadism, nounsadist, nounsafety valve, nounsanity, nounscar, nounscar, verbschizoid, adjectiveschizophrenia, nounschizophrenic, adjectiveschizophrenic, nounscrewed up, adjectivesocialize, verbsociopath, nounsplit personality, nounsubconscious, adjectivesubconscious, nounsuggestion, nounsuperego, nountherapy, nountorment, nountrance, nountrauma, nounvoyeur, nounwell-adjusted, adjective
a deranged gunman—derangement noun [countable, uncountable]