noun

derangement

derangement, insanity, disorder

He suffered from mental derangement.

He suffered from mental derangement.

The storm caused a derangement of the train schedule.

The storm caused a derangement of the train schedule.

((as a state)) the state of being seriously mentally ill and unable to think or behave in a normal way He showed signs of mental derangement.

((as a disruption)) the state of being disordered or not working correctly The derangement of his plans was frustrating.

Synonyms: insanity, madness, disorder, confusion; Antonyms: order, sanity, arrangement

From French 'déranger' (to disturb), from 'de-' (away from) + 'ranger' (to put in order). Literally, 'to put out of order'.

Think of 'de-range' as taking something out of its proper 'range' or order, causing chaos.

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