unmanned

Definition

Not operated by a person or a crew.

Etymology

From un- + manned.

Example Sentences

• "unmanned drones"
• "an automated e-mail message sent from an unmanned mailbox"
• "In his submission to the UN, [Christof] Heyns points to the experience of drones. Unmanned aerial vehicles were intended initially only for surveillance, and their use for offensive purposes was prohibited, yet once strategists realised their perceived advantages as a means of carrying out targeted killings, all objections were swept out of the way."