From The Collaborative International Dictionary of English v.0.44 [gcide]:
Derangement \De*range"ment\, noun [Cf. F. d['e]rangement.] The act of deranging or putting out of order, or the state of being deranged; disarrangement; disorder; confusion; especially, mental disorder; insanity.
Syn: Disorder; confusion; embarrassment; irregularity; disturbance; insanity; lunacy; madness; delirium; mania. See {Insanity}.
From WordNet (r) 2.0 [wn]:
noun
1: a state of mental disturbance and disorientation [syn: {mental unsoundness}, {unbalance}]
2: the act of disturbing the mind or body; "his carelessness could have caused an ecological upset"; "she was unprepared for this sudden overthrow of their normal way of living" [syn: {upset}, {overthrow}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
109 Moby Thesaurus words for "derangement": aberrance, aberrancy, aberration, abnormality, abnormity, alienation, amorphism, anomalism, anomalousness, anomaly, brain damage, brainsickness, clouded mind, confusion, convulsion, craziness, daftness, dementedness, dementia, deviation, difference, disarrangement, disarray, disarticulation, discomfiture, discomposure, disconcertedness, disharmony, dishevelment, disintegration, disjunction, dislocation, disorder, disorderliness, disorganization, disorientation, disproportion, disruption, distraction, disturbance, divergence, eccentricity, entropy, erraticism, folie, furor, haphazardness, heteromorphism, incoherence, indiscriminateness, inferiority, inharmonious harmony, insaneness, insanity, irrationality, irregularity, loss of mind, loss of reason, lunacy, madness, mania, mental deficiency, mental derangement, mental disease, mental disorder, mental disturbance, mental illness, mental instability, mental sickness, mind overthrown, mindsickness, misarrangement, monstrosity, most admired disorder, nonsymmetry, nonuniformity, oddness, perturbation, pixilation, possession, promiscuity, promiscuousness, psychopathy, queerness, rabidness, randomness, reasonlessness, senselessness, shattered mind, shuffling, sick mind, sickness, strangeness, subnormality, superiority, teratism, turbulence, unbalance, unbalanced mind, unnaturalism, unnaturalness, unsaneness, unsound mind, unsoundness, unsoundness of mind, unsymmetry, ununiformity, upset, witlessness
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