1535–45; un-1 + manned

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verb (used with object), unmanned, unmanning.
to deprive of courage or fortitude; break down the manly spirit of: Constant conflict finally unmanned him.
to deprive of virility; emasculate; castrate.

1590–1600; un-2 + man1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unman (ʌnˈmæn)
vb , -mans, -manning, -manned
1.  to cause to lose courage or nerve
2.  to make effeminate
3.  to remove the men from
4.  archaic to deprive of human qualities

unmanned (ʌnˈmænd)
1.  lacking personnel or crew: an unmanned ship
2.  (of aircraft, spacecraft, etc) operated by automatic or remote control
3.  uninhabited
4.  falconry (of a hawk or falcon) not yet trained to accept humans

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

1590s, "to deprive of the attributes of a human being," from un- (2) + verbal derivative of man (n.). Meaning "to deprive of manly courage" is attested from c.1600; that of "to emasculate" is from 1680s. Unmanned "not furnished with a crew" is from 1540s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
At its base the blast's expanding shock wave, visible as a whitish ring,
  engulfs a fleet of unmanned naval vessels.
He is also developing a tiny acoustic transponder that could be implanted in
  the jelly and used to track it with an unmanned sub.
Then explain to students that a space probe is an unpiloted, unmanned device
  sent to explore space.
He has conducted more than a hundred deep-sea expeditions, using both manned
  and unmanned vehicles.
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