- (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.