Wiktionary
n. The quality or state of being sure-footed
Wikipedia
Sure-footedness refers to the ability, especially when hiking or mountain climbing, to negotiate difficult or rough terrain safely. Such situations place demands on a person's coordination and reserves of strength as well as requiring sufficient appreciation of the terrain. A person who is sure-footed is thus unlikely to slip or stumble.
On many hiking trails and mountain tours, sure-footedness is assumed to be a pre-requisite without ever being defined. The term is frequently used in the literature presumably to ensure that the reader is made sufficiently aware that, under certain circumstances, one false step may lead to serious consequences.
Usage examples of "sure-footedness".
The Subcommandant crossed to the Makah's side with the sure-footedness of a cat.
Keeping to the middle heights, he scurried along with the sure-footedness of a rope walker, swinging from branch to branch only when it was necessary, making sure he always had more than one way of retreat open.
The handful of riding horses left were retained for their sure-footedness and good manners, not their exotic bloodlines, and kept exercised and gentle for the occasional guest by a gaggle of girls from the village.