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Webster 1913 Edition

Noun.

The state of being sure; certainty.

For more

sureness

he repeats it.

Woodward.

The law holds with equal

sureness

for all right action.

Emerson.

Noun.

Certainty.

For more sureness he repeats it. [Little used.]

sureness ‎(countable and uncountable, plural surenesses)

(uncountable) The property of being sure, certainty.
His sureness was born of having looked it up in a reputable reference book.
(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.
(countable, rare) The result or product of being sure.