DERANGEMENT

upset, derangement, overthrow

(noun) 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”

derangement, mental unsoundness, unbalance

(noun) a state of mental disturbance and disorientation

Source: WordNet® 3.1

Etymology

Noun

derangement (countable and uncountable, plural derangements)

The property of being deranged.

An act or instance of deranging.

(mathematics, combinatorics) A permutation of a set such that no element is in its previous position.

Source: Wiktionary

De*range"ment, n. Etym: [Cf. F. dérangement.]

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition