unpiloted en · ADJ
Etymology
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English piloted English unpiloted From un- + piloted.
Meanings
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(not-comparable) Lacking a pilot
The ship was unpiloted and adrift.
The trouble has been mainly due to the preceding 6.40 p.m. Sheffield express, which since being demoted from an "XL Limit" to a "Special Limit" schedule had presented unpiloted Class "6" 4-6-0s with loads at times up to 12 bogies. [In railway parlance "unpiloted" means the train had no pilot engine double-heading it.]
1959 October, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, page 479: