How sure one is, held apart from how right one is. Confidence and accuracy are separate measures and must be reported separately.
Latin confidentia (firm trust, confidence), from confidere (to trust fully), from com- (thoroughly) + fidere (to trust); how sure one feels, a separate measure from whether the feeling is warranted.
How sure one is, held apart from how right one is. The two numbers are reported side by side here rather than allowed to blur into each other.