unhinged

[uhn-hinjd]
adjective
1.
having no hinge or hinges, or with the hinges removed: an unhinged gate.
2.
unsettled, disordered, or distraught: He became unhinged when his friend died.

Origin:
1710–20; (def 1) un-1 + hinged; (def 2) unhinge + -ed2

Dictionary.com Unabridged

unhinge

[uhn-hinj]
verb (used with object), unhinged, unhinging.
1.
to remove (a door or the like) from hinges.
2.
to open wide by or as if by removing supporting hinges: to unhinge one's jaws.
3.
to upset; unbalance; disorient; throw into confusion or turmoil: to unhinge the mind.
4.
to dislocate or disrupt the normal operation of; unsettle: to unhinge plans.
5.
to detach or separate from something.
6.
to cause to waver or vacillate: to unhinge supporters of conservative policies.

Origin:
1605–15; un-2 + hinge

unhingement, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unhinge (ʌnˈhɪndʒ)
 
vb
1.  to remove (a door, gate, etc) from its hinges
2.  to derange or unbalance (a person, his mind, etc)
3.  to disrupt or unsettle (a process or state of affairs)
4.  (usually foll by from) to detach or dislodge

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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Etymonline
Word Origin & History

unhinge
used earlier in the mental sense of "to disorder" the mind, etc. (1612) than in the literal one of "to take (a door, etc.) off its hinges" (1616); from un- (2) + a verb derivative of hinge.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They all appeared to have become unhinged in some way over the course of their
  experience.
There's a touch of tragedy about your unhinged comment.
Not unless you want to see an auto executive come unhinged.
The leading rebels, though inevitably a mixed bunch, make incomparably more
  sense than the unhinged colonel.
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