overweening

This term carries a strong negative connotation, suggesting a level of pride that is not only excessive but blind to reality. It describes a specific type of arrogance where the individual is completely unaware of their own limitations or the validity of others' perspectives. While "arrogant" is a general term for superiority, "overweening" implies a reckless or delusional quality, often foreshadowing a failure or a "fall" due to hubris.

In a broader sense, the word can describe any quality or emotion that has grown beyond reasonable bounds, such as optimism or confidence. In these cases, it functions as a synonym for "excessive" or "inordinate," but it retains a flavor of misplaced confidence that borders on the absurd. It is primarily used in formal or literary contexts and is rarely encountered in casual conversation.