Source : Webster's Revised Unabridged Dictionary (1913)

Unmanned \Un*manned"\, a.
   1. [Properly p. p. of unman.] Deprived of manly qualities;
      deficient in vigor, strength, courage, etc.; weak;
      effeminate.

   2. [Pref. un- not + man + -ed.] (Falconry) Not tamed; not
      made familiar with, or subject to, man; -- also used
      figuratively. [Obs.]

            Hood my unmanned blood bating in my cheeks With thy
            black mantle.                         --Shak.

   3. [Pref. un- not + manned.] Not furnished with men; as, an
      unmanned ship.

Source : WordNet®

unmanned
     adj : lacking a crew; "an unmanned satellite to Mars" [syn: {remote-controlled}]
           [ant: {manned}]

unman
     v : cause to lose one's nerve; "an unmanning experience"
     [also: {unmanning}, {unmanned}]

unmanned
     See {unman}