Mentally unstable, chaotic, or severely disturbed in thought and behavior.
From Old French 'déranger' (to disorder), combining 'dé-' (opposite) and 'ranger' (to arrange or order). It literally means 'to put in disorder.'
The word 'deranged' implies that sanity is like things being neatly 'arranged'—it's a fascinating metaphor suggesting that madness is just disorder, which is why organized routines can actually help mental health!
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