unmannable
adj.— «A new word is entering the aero space lexicon as the US Air Force analyses its long-range strike options—unmannable: an aircraft that could begin its life manned, then evolve over time to unmanned operation; or one that could switch between missions, flying unmanned when the persistence required or threat faced is beyond a manned aircraft.» —“Farnborough review: Pilot optional” by Graham Warwick Flight (Sutton, United Kingdom) Aug. 1, 2006. (source: Double-Tongued Dictionary)
Further reading
Aubrey in Waco, Texas, says her mother used to warn the kids against contracting honkus of the bonkus, a fanciful name for a contagious disease. This colloquial term probably comes from the words bonk and konk, meaning “to hit” or...
Astronauts returning from space say they experience what’s called the overview effect, a new understanding of the fragility of our planet and our need to reflect on what humans all share as a species. A book about the end of the universe...