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countable and uncountable, plural carelessnesses
Lack of care; the state or quality of being careless. quotations examples
There were, however, 34 deaths among passengers in movement accidents, due mainly to misadventure and carelessness when entering and leaving trains in motion, falling off platforms and out of carriages, and opening and closing carriage doors.
1960 December, “Talking of Trains: B.R. safety in 1959”, in Trains Illustrated, page 708