disturbed

[dih-sturbd]
adjective
1.
marked by symptoms of mental illness: a disturbed personality.
2.
agitated or distressed; disrupted: disturbed seas; a disturbed situation.
noun
3.
(used with a plural verb) persons who exhibit symptoms of neurosis or psychosis (usually preceded by the ).

Origin:
1585–95; disturb + -ed2

undisturbed, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disturbed (dɪˈstɜːbd)
 
adj
psychiatry emotionally upset, troubled, or maladjusted

undisturbed (ˌʌndɪˈstɜːbd)
 
adj
not disturbed; uninterrupted: lots of undisturbed sleep

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

undisturbed
1610, from un- (1) "not" + pp. of disturb.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was the morning of a clear day and except for the natural swell of the
  undisturbed ocean, the water was fairly calm.
Left undisturbed, they'd glom onto each other and become a fortress of twisted
  shells.
What makes the dioramas rare and fascinating is that they are undisturbed
  relics from another era of natural history.
He's busy but at ease with his need to get his work accomplished undisturbed.
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