Etymology
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deranged (adj.)

c. 1790, of persons, "insane, disordered in the mind;" of things, "out of order," from 1796; past-participle adjective from derange (v.).

updated on July 27, 2018

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Definitions of deranged from WordNet

deranged (adj.)
driven insane;
Synonyms: crazed / half-crazed
From wordnet.princeton.edu, not affiliated with etymonline.