Etymology
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disturbed (adj.)

1590s, "agitated, put out of a settled state or regular order," past-participle adjective from disturb. Meaning "emotionally or mentally unstable" is from 1904.

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Definitions of disturbed

disturbed (adj.)
having the place or position changed;
the disturbed books and papers on her desk
disturbed grass showed where the horse had passed
disturbed (adj.)
afflicted with or marked by anxious uneasiness or trouble or grief;
lapsed into disturbed sleep
Synonyms: disquieted / distressed / upset / worried
disturbed (adj.)
emotionally unstable and having difficulty coping with personal relationships;
Synonyms: maladjusted
disturbed (adj.)
affected with madness or insanity;
Synonyms: brainsick / crazy / demented / mad / sick / unbalanced / unhinged
From wordnet.princeton.edu