The property of being sure, deft, confident of ability.(noun)
The result or product of being sure.(noun)
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Use "sureness" in a sentence
""But, no doubt, the sureness has been a good servant in his business," returned the Judge."
"A positive result in particle physics requires what's called five sigma, which is a probability of 99.99997 percent sureness, which is fantastic."
"Greatheart -- Greatheart the valiant -- her knight of the golden armour, going before her, strong to defend, -- invincible, unafraid, sure by means of that sureness which is given only to those who draw upon a Higher"