(uncountable) The property of being sure, deft, confident of ability.
The surgeon's sureness was the result of long study in school and long practice in the operating room, never did he hesitate and never was there a mis-move.
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(uncountable) The property of being sure, certainty.
His sureness was born of having looked it up in a reputable reference book.
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(countable, rare) The result or product of being sure.
Now the translator proceeds in Egyptian with some of the sureness with which he would deal with Latin or Greek.
His concentration was effected with his usual sureness and celerity, but whilst the French moved on Wittenberg, Blucher was marching to his right, indifferent to his communications as all Prussia lay behind him.
She writes with fair speed and absolute sureness.
We cannot claim for the Church absolute sureness of judgment as to what falls on one side of the line and what on the other.