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
If you think it's unsettling to read, try being the one that wrote it.
However, even those without such biases would likely find this particular bird
His hypocrisy regarding fossil fuel use is unbelievable and his increasingly
  erratic behavior is unsettling.
Lightning is a particularly unsettling product of bad weather.
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