overconfident

Example:His arrogant behavior earned him the disdain of his colleagues.

Definition:Having or showing an unreasonable sense of self-importance, typically accompanied by a lack of consideration for others.

Example:She was so boastful that people began to ignore her when she spoke.

Definition:Tending to speak too much about one's own abilities, achievements, or possessions, often in an intended to impress or attract attention.

Example:She is very assured in her ability to handle difficult situations, which makes her a reliable team member.

Definition:Having or showing confidence in one's abilities or judgment, but without being overly confident or arrogant.