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Longman Dictionary of Contemporary English
unmanned
adjective
EXAMPLES FROM CORPUS
▪ One platform in the Viking field has already been turned into an unmanned unit.
The Collaborative International Dictionary
Unmanned

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.

Douglas Harper's Etymology Dictionary
unmanned

"not furnished with a crew," 1540s, from un- (1) "not" + past participle of man (v).

Wiktionary
unmanned
  1. Not operated by a person or a crew. v

  2. (en-past of: unman)

WordNet
unmanned

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

unman
  1. v. cause to lose one's nerve; "an unmanning experience"

  2. [also: unmanning, unmanned]

unmanned

See unman

Wikipedia
Unmanned

Unmanned describes machines without a person on board.

"Unmanned" usually refers to uncrewed vehicles (remote controlled, remote guided or autonomous) such as:

  • Unmanned aircraft system (UAS), synonymous with UAV
  • Unmanned ground vehicle (UGV), such as the autonomous car
  • Unmanned aerial vehicle (UAV), unmanned aircraft commonly known as a "drone"
  • Unmanned surface vehicle (USV), for the operation on the surface of the water
  • Autonomous underwater vehicle (AUV) or unmanned undersea vehicle (UUV), for the operation underwater
  • Unmanned spacecraft for unmanned spaceflight, both remote controlled ("unmanned space mission") and autonomous (" robotic spacecraft" or " space probe")

It can also refer to:

  • Unmanned reef lights of the Florida Keys
  • Unmanned (Y: The Last Man), the first story arc of the comic book Y: The Last Man.

See also:

  • Vehicular automation

Usage examples of "unmanned".

Then they could no longer refrain themselves, but ran down from the Speech-Hill and the slope about it with great and fierce cries, and clomb the wall where it was unmanned, helping each other with hand and back, both stark warriors, and old men and lads and women: and thus they gat them into the garth and fell upon the lessening band of the Romans, who now began to give way hither and thither about the garth, as they best might.

To offset this handicap, Gordian and Nimec had shipped Ricci another of their little toys, a SkyManta unmanned air recon vehicle that looked.

Chakotay took a breath to order the tractor beams on, but before anything came between his lips, Kes suddenly charged to the unmanned helm and dropped into the seat.

They passed over the wire at less than a hundred and fifty feet, then the racecourse-like stretch of open ground, then the lower, unmanned fence on the Finnish side, and a narrower space clear of trees, then the forest that engulfed both sides of the border at that point.

She now lay damaged, unmanned, stranded on a bar near the chain, not more than a pasang away.

They cowered, or fled, or wept where they stood, unmanned by their terror of treacherous black sorcery, and the rampaging conflagrations that had unraveled their stern strength and immolated brave officers and companions.

For this underground installation was a small, unmanned storage depot containing not more than 1,800 large cylinders of a particularly nasty psychotomimetic gas, with minimal laboratory facilities attached.

Six smaller white dots corresponded to the positions of the unmanned probes, arrayed in a hexagonal formation between the pulsar and the general direction of Mestiko.

It was an unmanned station but its doors were blown open and odd-looking creatures ran through it, ransacking it, in fact, searching for weapons.

With a curse he leaped off the wagon after Narm, leaving it unmanned and unsteered in the tumult.

In addition to the Furies Point, they monitored forty unmanned listening posts, most along the Klingon border.

Its importance would be improved still further if it operated in tandem with a Mars polar orbiter which would geochemically map the planet, or with an unmanned Martian aircraft which would photograph the surface from very low altitudes.

I will not dwell on the next few minutes, for no one likes to acknowledge that he has been unmanned even for a space.

The unmanned iceberg would run aground or drift away in the vagrant tropical currents to its quick destruction somewhere in the warm midocean waters, far from the anchors on the continental slope that kept it moving on course.

By the time Plautus arrived several minutes later, we were both rolling helpless on the floor, and his face unmanned us even further.