overconfidence

This term carries a strong negative connotation, suggesting a dangerous gap between a person's perceived skill and their actual competence. It describes a psychological state where optimism transforms into a liability, often leading to reckless decision-making or the dismissal of critical risks.

As an uncountable noun, it refers to a general quality or state of mind. It cannot be pluralized or counted as individual units; instead, it is measured in degrees, such as having a great deal of overconfidence or a touch of overconfidence.