verb (used with object), unsettled, unsettling.
to alter from a settled state; cause to be no longer firmly fixed or established; render unstable; disturb: Violence unsettled the government.
to shake or weaken (beliefs, feelings, etc.); cause doubt or uncertainty about: doubts unsettling his religious convictions.
to vex or agitate the mind or emotions of; upset; discompose: The quarrel unsettled her.
verb (used without object), unsettled, unsettling.
to become unfixed or disordered.

1535–45; un-2 + settle1

2. upset, disturb, unbalance, confuse, disconcert.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unsettle (ʌnˈsɛtəl)
1.  (usually tr) to change or become changed from a fixed or settled condition
2.  (tr) to confuse or agitate (emotions, the mind, etc)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1598, "undo from a fixed position, from un- (2) + settle. Of the mind, feelings, etc., attested from 1644. Unsettled "not peaceful, not firmly established" is recorded from 1591. Meaning "not occupied by settlers" is attested from 1724.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They weren't afraid to unsettle the students, and they weren't so concerned
  with whether the students liked them.
The prospect of a new grammar school is likely to unsettle the coalition.
Both courses of action could unsettle the markets, and neither would be right.
He is confronted with questions of choice that unsettle complacency.
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